Challenge: 8 color music.
150 x 50 pixels, 8 colors.
Sometimes you can't get a song out of your head...hehe
My 2nd entry: What can I say, I like small images and limited palettes. The first entry was a bit quick & simple...here I took the time to experiment with some textures.
Edit: Changed the look of the note - dunno if it's better? Kept the original preview for comparison.