I generally watch Television or DVD's when I'm writing as I live in the kind of household that is always noisy, no matter what, so I've gotten used to things being on and happening as I'm writing, music though is something I find very difficult to write to, as even classical music I tend to drown myself in a lot.
But anyway: Nightwish are my main inspiration along with soundtracks Harry Potter and Star Wars mainly, and classical... I listened to Alice Cooper the other day, he's pretty cool.