QUOTE(DMviolinnutter @ Sep 28 2009, 05:25 PM)

I have some homework where I have to turn a piece of music I like into art, but I have no clue what piece to choose!

Please help
Look at the work of Kandinsky!
As Skylark mentioned you can either go down the route of abstraction or realism. With regards to realism I have seen a painted interpretation of Beethoven's Moonlight Sonata which is nothing more than an upright piano with a candlestick on the lid and a lake in the background. The painting is 'nice', yet I would really recommend going down the route of abstract painting.
If you choose abstraction, you can interpret mood, rhythm, harmony (is the piece dissonant? If so you could juxtapose two 'awkward' colours) etc. Again, I would encourage you to look at Kandinsky, his most spontaneous paintings he called 'Improvisations' and his more elaborate works, 'Compositions', as with music. I would be surprised if he doesn't provide some form of inspiration!