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The Ultimate Piano/Keyboard Course from total Beginner to Advanced-7 : More chords & special chords

teacher avatar Martin Cohen, Teacher, musician and composer

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Taught by industry leaders & working professionals
Topics include illustration, design, photography, and more

Lessons in This Class

    • 1.

      Introduction

      1:49

    • 2.

      Major 7th chords

      4:19

    • 3.

      Adding notes to major chords (add2, add4, ...)

      14:08

    • 4.

      Adding notes to minor chords

      3:00

    • 5.

      Slash chords

      7:59

    • 6.

      Sus chords

      6:53

    • 7.

      Chord extensions

      10:51

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About This Class

This piano course is Part 7 of a series of 10 courses. To see the 10 courses and their content, please scroll down.

When you really want to play the piano, you a need a course that takes you by the hand and guides you step by step.

There are many 1- or 2-hour courses that promise you that you can play songs after their course, and often that’s true: after such a course you can play several songs. But do you really master the piano? Are you really able to learn independently new songs yourself? Are you able to read music? Do you understand music theory?

Playing the piano is not a skill that you can easily learn in a 1- or 2-hour course. You need many more hours to really master this fantastic instrument.

That’s why this course is huge. And that’s why this course is split up in a series of smaller courses.

This is part 7 of this course.

When you’re a total beginner, you should start in part 1.

If you already have some piano skills, you could eventually start in this or in another course of this series.

Scroll down to see all the courses in this series and to decide with which course you should start.

And oh yeah: also in my course you will be able to already very quickly play your first songs (like with those 1- to 2-hour courses), only in my course I will take you much further than that :-)


***********************************************************************************************

THE COMPLETE ONLINE PIANO COURSE THAT WILL TAKE YOU FROM A
TOTAL BEGINNER TO AN ADVANCED PIANO PLAYER
The way the course is created, with lots of songs and easy explanations of every detail, means
that you will advance rapidly every day.

VERY QUICKLY, YOU WILL BE ABLE TO PLAY YOUR FIRST SONGS ON THE
PIANO OR KEYBOARD
At a very early stage, you will already apply what you’ve learned and start playing songs.
And what makes it a real pleasure to practice, is that you play a song together with a band that
accompanies you while you are playing on your piano or electronic keyboard.

LEARN PIANO IN A FUN WAY, NOT BY ONLY ENDLESSLY RUNNING UP & DOWN
THE SCALES
In order to play the piano or keyboard well, you have to practice scales. But only endlessly going
up & down the scales is not a very fun way of learning the piano or keyboard, that’s why in this
course you practice the scales in songs that contain just the notes of that particular scale.
And of course, the band will accompany you in all the songs.
This makes practicing the scales a pleasure!

***********************************************************************************************
Important:

  • If you’re a total beginner, then start with Part I.
  • If you want to start in a later course of this series, be sure you master the skills and
    knowledge of the former courses. The only exception is for the reading music course (Part
    IX of this course). You could eventually start Part IX (reading music) after part I of this
    course series (you would only not yet be able to play the practice songs in Part IX, but for
    the rest you can follow Part IX without problem.
  • Again: if you already have some piano skills: look at the course descriptions below to see
    in which class you should start. Be sure to master the skills and knowledge of the former
    courses of the series.
  • You’re now in Part 7.
    Click on one of the course titles below to go to that course.

***********************************************************************************************

Below is a list of the courses in this series. To go to another course in this series, just click on the
title of one of the courses below.

Part I:
The Ultimate Piano/Keyboard Course from total Beginner to Advanced - Part 1: Playing in
C, F & G
In this first piano course, you will learn:

  • First steps on the piano: body posture, hand position, playing ‘smoothly’, names of the
    notes, middle C.
  • The intervals: half tone, whole tone, octave.
  • The C, F & G major scales and songs in those tonalities.
  • The C, F & G major chords (triads) and songs with those chords.
  • Inversions of the C, F & G major triads.

Part II:
The Ultimate Piano/Keyboard Course from total Beginner to Advanced - Part 2: Playing in
D, A, E & B
In this second piano course, you will learn:

  • The D, A, E & B major scales and songs in those tonalities.
  • The D, A, E & B major chords (triads) and songs with those chords.
  • Inversions of the D, A, E & B major triads.

Part III:
The Ultimate Piano/Keyboard Course from total Beginner to Advanced - Part 3: Playing in
Bb & Eb – Intervals and Circle of Fifths
In this third piano course, you will learn:

  • The Bb & Eb major scales and songs in those tonalities.
  • The Bb & Eb major chords (triads) and songs with those chords.
  • Inversions of the Bb & Eb major triads.
  • The intervals: minor & major 2nd , 3rd , 6th and 7th , perfect unison, perfect 4th & 5th , the tritone interval
  • Interval inversions.
  • The circle of fifths.

Part IV:
The Ultimate Piano/Keyboard Course from total Beginner to Advanced - Part 4: Minor
Scales & Chords
In this fourth piano course, you will learn:

  • All the natural minor scales and a song in A minor.
  • All the natural minor chords (triads) and songs with those chords.
  • Inversions of minor triads.

Part V:
The Ultimate Piano/Keyboard Course from total Beginner to Advanced - Part 5:
Independent Hands – The Sustain Pedal
In this fifth piano course, you will learn:

  • The 4-step method for independent left- & right hands on the piano.
  • How to use the sustain pedal.
  • Songs to practice the 4-step method & the use of the sustain pedal.

Part VI:
The Ultimate Piano/Keyboard Course from total Beginner to Advanced - Part 6: Seventh
Chords – Diminished Chords – More Intervals
In this sixth piano course, you will learn:

  • Dominant 7th chords.
  • Minor 7th chords.
  • Diminished 7th chords.
  • Diminished & Augmented Intervals.
  • Songs with seventh chords.
  • How to accompany a singer.

Part VII:
The Ultimate Piano/Keyboard Course from total Beginner to Advanced - Part 7: More
Chords
In this seventh piano course, you will learn:

  • Major 7th chords.
  • Add2 & add4 chords.
  • Slash chords.
  • Sus chords.
  • How to extend 7th chords with 9th, 11th & 13th.

Part VIII:
The Ultimate Piano/Keyboard Course from total Beginner to Advanced - Part 8: The
Missing Scales*
In this eighth piano course, you will learn:

  • The 3 still missing major scales of: Ab, Db & F#/Gb.
  • Their relative natural minor scales: Fm, Bbm & D#m/Ebm.


*: If you don’t want to play in those more ‘difficult keys’, you can eventually skip Part VIII and
go on with Part IX.

Part IX:
The Ultimate Piano/Keyboard Course from total Beginner to Advanced - Part 9: Reading
Music
In this ninth piano course, you will learn:

  • The notes on the treble and bass clef.
  • Note duration: whole/half/quarter/Eighth/Sixteenth notes, triplets.
  • Rests.
  • Measures (bars).
  • Time signature.
  • Sharp & flat notes/Key signature.
  • Repetitions/D.C. al Fine.
  • Sheet music/Lead sheet/Chord sheet.
  • Songs to practice music reading.

Part X:
The Ultimate Piano/Keyboard Course from total Beginner to Advanced - Part 10: More
Songs to Practice
In this tenth piano course, you will learn:

  • More songs to practice reading music.
  • More advanced songs.

Meet Your Teacher

Teacher Profile Image

Martin Cohen

Teacher, musician and composer

Teacher

Martin Cohen is since about 25 years a teacher of physics, mathematics and informatics.  

He taught at several schools in and around Amsterdam and at the European Schools of Brussels (Belgium) and Luxembourg.

He recently decided to quit his regular teaching job to concentrate only on online teaching.

Martin is originally from Amsterdam, the Netherlands.  

He is a passionate musician and composer. Since the age of 8 years, he plays the piano.  

He played in several rock, blues and jazz bands and he has now a jazz quartet.  

At the moment, he teaches (online) the piano, music theory and composing techniques.  

Martin has a masters degree in physics from the Free University in Amsterdam.

See full profile

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Transcripts

1. Introduction: Hi, this is part seven out of ten of the course series, the Ultimate Piano Keyboard Course from total beginner to Advanced. My name is Martin Cohen. I'm a piano teacher, a jazz musician, and I'm a composer. Now if you are a beginning piano player and you want to learn to play the piano, then I would advise you to go to part one of this course series. In the description of this very course, you will find a link to part one. If you're not a beginner, you're a little bit more advanced, you could eventually start in another part than part one. In that case, you can also go to the description of this course. You will see the description of all the courses, of all the ten parts of this course series. You can decide in which course you want to start. What are you going to learn in this particular course of the course series? Now, this particular course goes about special courts. We're starting with the major seventh court. Later we will add nodes to tries to get the add to the add four courts and also other courts. I will teach you shorts, I will teach you courts. Finally, I will teach you how to add notes to seventh courts. For example, ninth, 11th, 13th. To make the courts sound more interesting than just the normal everyday courts, I would like to thank you very much for your interest in my course. I hope to see you in the inside of this course or in any of the other courses of this course series. 2. Major 7th chords: In this lecture, I want to talk about major seventh chords. Now, major seventh chords to begin with, I said it before, they are not often seen in popular music or in rock and blues. They're seen a lot in jazz. But yeah, if you want to continue in music, that's not only if you want to play jazz, but if you want to continue in music, it's good to know what they are and how to play them. Major seventh, they are actually major seventh courts based on a major triad but also based on a minor triad. I will in this lecture only look at major seventh court. Major triad on minor triad, they're even less frequently used. Major triads again in yes, you see them. Major seventh, I will start as usual with C T. Well, it's very simple, you not as in the dominant seventh. Minor seventh, but you add major seven, which is the seventh note in the scale 1234567. Actually, that's all. This is a major seventh. Now perhaps it sounds a little bit exotic to you. That's mainly because you don't hear them very often in popular music. Of course, you can play inversions. This is a root position, by the way. First inversion, second inversion, third inversion, and then I'm back in root position. I will show some other major seventh chords. Major seventh. Look at the seventh note in the scale. 1234567, Major try with the seven major seventh. This is major seventh, of course all the inversions, but you can find it out yourself. Another way to quickly find the major seventh, it's just a half tone below the root. Let me take another one, major seventh. If you have the major T, go to the an octave up and a half tone lower. And that's the major seventh. It's also of course, the seventh note in the scale, but you can find it by just lowering the root by a half tone. Major seventh. Okay, that's it about major seventh chords. As I said, there are also minor major seventh chords. Very simply said, it's a minor. Try it with a major seventh. Now listen how exotic this sounds. Perhaps you don't like it mainly because you're not used to the sound. Again, in jazz they're used. But I almost dare to say that never in popular music. Okay, I will not talk again about the major seventh chord. It's based on a minor triad. This is a minor third, major seventh, because this is a major seventh. That's all I want to say about it. Concerning all the other major seventh chords, you can find them yourself of. But you can find all the major seventh courts in the resources of this lecture with all the inversions. To find the resources that go with this lecture, just go to the projects and resources step in this course. You find here a download link where you can simply download the resources. 3. Adding notes to major chords (add2, add4, ...): Okay, in this about other courts. About more special courts than the courts that you're used to. As you know, in the last lecture we did the major seventh court, which is not that special. Okay. It was a court that we haven't seen yet. It therefore, that I put it in this section, what we're going to do now is looking at adding to court. I will first do that major major tris, you can also add to to seven courts, but we do that later. For now, just try it and we're going to add notes to the triads in this major triads. In the next lecture, I will do the minor triads. For simplicity reasons, I start with major triad. Now, what notes can add? I will mainly look at from the scale. I will only look at notes from the scale. Now, I will not add the seventh because that becomes a seventh chord. We did that already. What other than the seventh, can I add? Well, when we look at the scale, here's here's one here's one. As you know, the court itself is not 13.5 of the scale. We could add note 246 again seven, because then it becomes a seventh court. This is not about seven court in major, that would be the D or the. Now, let's start with the D. The second we can add just two normal C major tie the second. I then get this court, now we call this court two. You can see here above the virtual piano, not two, perhaps you think it sounds a bit dissonant. Okay? Could be, note that dissonance is not a bad thing. Dissonance can be beautiful if it's applied correctly. Two, you can do other inversions. Of course you could do this. Well, those are other inversions of the C A two. Now you could ask, why don't I put the D up here? It's also a possibility. I will talk about that possibility later in this section. That's two. Now I said you can add the second, but you can also add the fourth note in the scale of 1234 major is the fourth in my major. Add the fourth, I get this. We call this, do you see it above the virtual piano? Of course. Also here you can make inversions. You can find it out yourself. You can either with a two and with the four, resolve the courts to its normal major court. What I mean is this tension, it has a bit of tension in the court, adds to, but when you resolve it to this court, to the normal major court, then it's a release. Music Is very much about tension and release. You build up some tension and release it, that can be very, very nice. Then you hear it a little bit of tension and then the release. Same thing for the four. Very often, to make it more pronounced, this tension release, you could in the case of two, in the first case not even play the E. Then you have tension release or with the four tension release. Okay, so you can use it for that. The six, we can add the six also or in major six is of course 123456. So I could add to the normal major. I get this co, Okay. Now perhaps you say to yourself, but this is an A minor minor seventh, first inversion. The root position, root third, fifth, minus seven. And when I take the lowest note one Oct have this court, the minus seven court in first inversion is exactly the same thing as a six. By the way, we don't say at six, we just say six. That's just the convention. And you see it above the virtual piano at six. But just six? Yeah, it could be a confusion. Is this an a minor seventh court or is this a six court? Well, I would say when you play A in the bass, then it's a minor seventh. When you play a C in the base, we then it's a six court. Simple as that. Okay. Now we've seen in major how this works. I will quickly go over some other tonalities so that you can see how this adding two chords also goes in other keys. For example, this is the major chord. Well the second node in the major scale is of course, the node A add two port. Again, you can make the tension, release tension in the two, well, the inversions, you can find that out yourself. A four. What's the fourth note in the major scale? 1234. That's, this would be a four. Also here you can make this tension release. 66 note in the scale of major is 123456. That's here you have six again, this looks as an minus seven T. It's the same thing as with the -7.6 when an E in the base. Yeah. Then it's an E minor seven squared when you play in the base. Yeah. Then it's a six squared. Okay? Okay, another example. For example, D. This is D major. With the second of the D major scale, we have D at two, tension release with the G, which is the fourth note in the scale of D major 1234, we can make D at four, tension release D at four. Of course, you can also add the sixth, well the sixth note in the scale of major 123456. It's B. This is six, I watch out. Not a six, but just six. Looks like a B minor seven scored. Yeah. When I put the B in the base then it's a B minus seven squared. But when I put the D in the base, then it's a six scored. Okay. One last example, the major major. Try it. The second in major is sharp. This would be at two tension release. The fourth note in the scale of major 1234 is a. We can make a four tension release. Works a bit nicer when I put in the tension, not the third also because they're very close to each other like I did in all the other. Okay, that's a 46123456. That's with the C sharp. This is six. Now, how can you use those extra nodes in Ts? For example, if you have a Port chord progression as follows, you play, for example, who measure of four beats, a whole measure of four beats, the whole measure four beats, a whole measure of four beats. Well if you would play just 1234234. 234 to 34. Imagine I would play that while accompanying a singer or play in a band or whatever. Yeah, it's a bit boring. Eh, four beats of just discord lying there. Well, that's where your extra notes come in. You could for example, in the secord play a little bit with this. For example, with add two in the base will just play the bass notes. I can double the, play them just single, but let me double them for now. I play a little bit with this second and then in, for example, this A, that's the second. Alright, That's a ad two that I get. Then in the D, what could I do? This is the normal D. Try it in second inversion, that's a fourth back to my normal D. A two back to my normal D. Then in the A, I could do this, for example. What did I do? See what I do here. I have both the second and fourth at the same time. Come back to the normal fifth, but okay. And then I take the six, which is the F sharp, and come back to my normal A chord. I could make my whole progression, for example, like this. You play a little bit with a 246. Now of course, I exaggerated a little bit. Don't overdo it here. I did a little bit too much. Perhaps you have to when you're playing with other musicians, listen to the other musicians what they're doing. And don't be too much in their way. If there's someone singing and you're very busy adding all kinds of stuff, yeah, you're in the way of the singer also for other instruments. Let your ear be the guide of what extranos you add and how many you add. Okay, that's it for now. See you in the next lecture. 4. Adding notes to minor chords: Now the notes that we added in the former lecture, second, the fourth, and sixth, we can only add them to major chords, we can also add them to minor triads. In this case, for example, I will start with C. Again. The minor triad, as you know is this one. And the second is, of course, still the D. This would be minor add two. Here you see the notation in a two. Of course, if you can have a minor two, you can also have a minor at 44. As you know is the 46 is a little bit another story because as you know, the minor scale, the C natural minor scale is 1234566, note is now a flat. But you can add the six minor court. This is a, this is also a possibility when you're playing, let me say first minor court, then a minor court just quickly, a second minor at two. I can for example, in the minor sixth, but would I, the major sixth in the scale? Or rather the six? Well, let's come back from the scale. Let's say we're in the scale of minor I. Do we see that? This one sounds a little bit dissonant. Now, everything depends on the context. Of course you can play it, but I think that when you're in the scale of minor in scheme in there's flat, this sounds much better. Again, this is as what I've said in the former lecture. Let your ear be your guide. Anyway, you can also add the second fourth and the six, be it to the major six or minor six minor chords. 5. Slash chords: In this lecture, I will talk about slash chords. What are slash chords? Let me first start by just showing you a chord progression in second in version and a minor. You see that in the base I play, which goes with the major chord. Which goes with the major, and that goes with the minor. Now, it sounds much nicer when you do it like this. Look at the base. The left hand I have exactly the same and a minor. The only thing is that when I play the, I don't have the root in the base, as a base node in my left hand. But the third of the chord, in that case, I have a descending base line from C to B to A. And that creates a very nice effect. I want to look at this, this is a major, major. Try it in the base, you can notate that as a slash chord. You can see here above the virtual piano that I write it as. It means that I play a try with a B in the base. The letter A is the base, the letter before the ching that is a slash court. Now perhaps you remember that we used before a court. I didn't mention that at the time that it was a slash court, but that was when we were playing Hey jute in the lecture How to Accompany a singer. The lecture is called How to Accompany a Singer. He jute. That's in section three about courts. If you don't remember, you can go back to that lectures at about 6 minutes into the lecture. In the chorus, play the chords B flat minor and then minor. Now I played it just with the base nodes B flat. And what I actually play, you see flat play broken. Then play the minor, that's the one where I don't play in the base, but in this case the fifth of the chord with A in the base. This one can it as a T, A minor over an A. You see it above the virtual piano denotation. You can do it on major courts, you can do it on minor, on Tris, you can even do it on seventh chords. I will show you later anyway, you've seen it before in the haul, you see it very often where you have descending baseline or an ascending base line. That also sometimes occurs. But it's not the only use actually you can play any below a. Try it or for example, of course, if I play in the base, it's just A. I will never, not with notation, listen how nice this sound with a D in the base. I will talk a little bit more about this court in next lecture, but this would be over D court. Now, for example, if you have an A over a court court over a A in the base, you can not it of course, as this court is actually nothing else than just an ordinary a minor seventh court. If I take the 0, this is a minor seventh court. In some cases you can create a normal court with just a court. Now as I said, you can play major minor, but you can also seventh courts. For example, this one minus seven, you see it's in third inversion over in the base. Sounds also very nice. Now you can play any over any base. Of course, sometimes it will be very dissonant, sometimes it will be dissonant. As I said already in a formal lecture, dissonance is not something bad. Dissonance can be beautiful. Just use your ear as a guide. Okay, I will play you one other chord progression where you see a very nice example of a descending base line. Which you can not with notation. For example, minor, just a normal minor chord with a normal in the base. Then we play a minor, but with a B flat in the base. You can not that as minor flat with A in the base, you notated. See the descending base line? C flat. A flat. Let me just play it and I will also kick in, add two nodes and some other notes. Just have a look. And then again, so what did I do? The C minor, for example, or you can play anything you want. I play the minor seventh, so then it's minus seven as a T with an A flat in the base. So you would write it as minus seven A flat. Okay. Just to show you this example of how it can be used, that's cords. Of course, you can see them sometimes in lead sheets, now you know what they are. 6. Sus chords: I'd like to speak about sus courts. What is a skort perhaps? You've seen them already in sheet music or in lead sheets, for example. Two or four or just S without dimension of four or two. So what's that? Well, actually let me do the example. To begin with, the two court is just a court where the third is replaced by the second. That's the difference with an Ad 2.2 you had the second and the third now to court in this case is just D, G. The third has been replaced by the third of this resolves tension release. That's two. In the same way you can, of course, make a 44 cord there. The third is replaced by the fourth, this is a G, of course also this resolves nicely to a triad. Sometimes you also see just what is now. When you see just S, it normally means S four. This would be some other chords, S24 or Ds2d4, or let me take another one, for example, 24, or simply, it's actually very simple. Now to be honest, it is actually to have also a third in a score, the fourth and eventually the second to also have a third. But this is actually only done in jazz, as you know. This is not a jazz, I will not talk about this possibility anymore. But if you might see this, then you know it's possible. Okay. Now there are also seventh chords with, for example, seven as well. It's the same thing, you just add the seventh, for example, for let me play in the base chord would be this. When you add the seventh, then you have the seven chord. Now, very often when you see seven s, you can add the second and fourth. What do we have? Seven, second, fourth, and fifth. This would also be a seven scored. I have an added second. What is it? Fourth? No, third. You can leave out eventually the fifth, Fifth is not always necessary. You can leave out the root because I already played with my left hand. I have discord. Have a look at this chord, actually. What do we have? A C in the base, but what do we have in the right hand? B flat. That's the B flat. The B flat major. Try it. This is A scored, but I could write it as a B flat. Over. Look above the virtual piano there, you see it written B flat. Actually you can make a seven scored by just taking the major try a whole tone down the root. For example, a G cord in the base. A whole tone below the is the I take the major chord. You can take it in other inversions. Of course, very often the second inversion sounds the strongest case for the, we have in the base and the B flat major. Second version of you can take other inversion as I said, but this one strongest D. I showed you this one in a former lecture. This is the D sounds better, second inversion. Now let me show you one last example, a little bit more difficult, with some black keys in it. For example, B flat in the base. I take a B flat, one whole tone below the B flat flat. A flat major is this, but I will take it in second version. This is a bit low, let me take it here. This is a B flat sort. Now sorts also very often resolve to their normal major chord. For example, when I have a C skirt, then it resolves nicely to the Cod. Sometimes skirts and then they have a very nice floating sound. Okay, those are skirts. 7. Chord extensions: In this lesson, I want to talk about extensions. What are court extensions? I will start to explain this with a dominant seventh court, 171357. You see that there is a logical order, a third up, in this case, a major third up, we come to the three third, in this case a minor third, because from E to G is a minor third, we come to the fifth, This is a third, this is a third, a major third, then a minor third, and from G to B flat is also a third minor third in this case. Anyway, we're going up in third, 1357. Now, what would logically be now when you have the series 1357, the next one would be nine. What would be nine? Well, when we go from B flat a third up. Well, when it's A -30 it would be this one, but let's go up a third. It's this one. Now, why do I go up a major third and a minor third? Because I want to stay in the key of major. Of course, this is not major, but that's the only exception, 77, when I go 1357 and I would go to nine, then I would come to the D. That means that the D is the ninth. And I would say, **, **, **, Martin, wait a minute, you said that D is the second when we did the C two, for example, then suddenly was the second. Now suddenly you say it's a ninth. What is it actually? Well, let me go back to the Ad two here. The D, I call it a second, but remember that when we were doing the Add that I said we could place the D also Here, let me play it like this. We actually, when you do it in this way, then you would call the D the ninth instead of the second. It's called the ninth when it's placed above, above the major triad and it's called a second when it's placed within the nodes of the triad. This is then the two as we learned it before. This would be a nine, that's the difference. Let me go back to seventh chords. This let me just play in the base with the left hand. I can play it here. I can also play an octal. Then I only have those nodes left here. Now I call it a nine. Now why not a nine? Well, because I have the seventh also in it. When there's also a seventh, when it's a seventh chord with an added ninth, then I don't say a nine, I just say 99 is actually the court. With a ninth and a seventh. Add nine would be this one. I don't play now the C here, because I already have it in my left hand. This is a nine. This is a ninth. Okay, that's the ninth. I can go on by adding other third. Remember we third till the ninth. Now I go another third within the key of arrive at. Now this is nine, then this would be ten only we don't call it ten, but this would be 11, this Court would be 11. Now, to be honest, when you see 11th, you mostly don't play the nine, but the seventh is always in it. This is 11th. If you don't play the seventh, this court well, this is a 11. Remember that four was, this is the fourth. But when you add the fourth here, then it's an 11th. You could say that 11th is a open voicing and four is more closed voicing. Open voicing, the ninth and the second two. This is a voicing, nine is an open voicing. Okay, the 11th would be this one. Now, to be honest, the 11th sounds a bit yeah, dissonant very often. In jazz, they make it a little bit, a half tone higher. You would call it then, the sharp 11th. But that's going too far for this course. The important thing is to know that this is the 11th. We can go one step further, 1357 in this case, minus 791-114-1213, this is the 13th. Of course, we know it's the sixth, we would call six, but when we play it with the seventh, then we call it the 13th. Remember that 13th is just a seventh chord with an added 13th. You can call it six. Well, we call it 13th because it's placed above. The seventh is also included. Can I play it with the ninth together? Of course, you can play it also with the fourth. The 11th. Well, as I said, the 11th is a bit dissonant. I'd rather leave it out. This is also a 13th in this case, with an added ninth, but normally we don't put it in the symbol. This is 13th. This is also a 13th. Let me show this also in other, let me show you, for example, the seven. This is the ninth. The 11th would be this one, but sounds a bit dissonant. And the 13th is this one. Another example is the 79. This will be 11, but as always, the 11 is a bit dissident, 13. Now, can I do this also on minors? There we go, minor seventh with the ninth in ninth, perhaps nicer when I play in the base a bit lower then I don't play it in the right hand anymore. Sounds nice in ninth. Now with the fourth, let me play it like this or 11. In this case it sounds the 11th, the dominant seventh court. It didn't sound nice, but in the seven it sounds. Now, with a dominant seventh, that sounds very dissident. Doesn't mean that you cannot ever play it, but it sounds quite dissident. 11.13 but for some reason, in minor chords we call it rather minor six, of course. Let me show it in other chords. In minor seventh ninth, minor 11th, minor six. Now, when you see, for example, in a lead sheet the symbol C seven, then actually you may yourself just add a ninth. Why not? It sounds nice and it's in the scale of C. You can also add the 13th. Very often used voicing for a seventh. Let me play it here in jazz is this one. I have the root here, I have the major third here, the minor seventh ninth here and 13th here. Now you might say, hey, where's the fifth? The, I don't have it. I said before, I think the fifth is less important. This is a very nice jazz sounding seven voicing. That's extensions.