I ended up changing the colour scheme whilst adding the texture. I also added the music notes, which I think help the composition and emphasises the theme.
My artwork ended up looking pretty different from my sketches as I wanted to go with a more geometrical look. I was hoping that I'd be able to create it using Illustrator but that programme kills me. So I reverted to Photoshop. I think the yellow works well against the dark blue. Hopefully the textures will help to make it really come alive.
I began by wanting to illustrate a super instrument made out of a selection of brass instruments. But the composition felt a bit unexciting. The people were added to create some tension.
I tried a different approach below by playing with the idea of unwantingly being susceped to noise. I once again wanted to create the feeling of tension by portraying the calm before the storm.