I'm a writer, and I have to say that music is one of the main sources of inspiration, sometimes it's the lyrics that gets me, but most times it's the music itself, be it powerfull, sad or just generally awsome.
I've written two short novells (that nobody has ever read), both based on the Halo story (lame, I know), and am currently writing a third, which is my own story.
In the beginning it was Linkin Park that inspired me, but i got over it pretty quickly, now MaSu is my prime source of inspiration.