I'm really huge on these guys, and its really wonderful to listen to them branching out, and Jocelyn Bartum has a set of pipes that are amazing.
I have noticed during my writing that the "mood" of my music plays pretty directly to the way I write. I am not 100% a "plan, diagram, write to formula" writer. I have a general idea of what I want to see, but the characters often surprise me and grow during a piece, and the music I'm listening to during the writing helps inspire romance, rough, orgasm, power, submission... I have started working my playlist into "mood categories" I have some for the slower ballads and romance, and some for the hard core stuff, and I highly recommend you try it.
Here's a fun writing exercise:
Pick a topic and write 200 words on it in silence.
Take the same topic and turn on a pumping fast-paced song, write 200 words.
Take the same topic and turn on a mood ballad, write 200 words.
How different are they? What characteristics do you notice became easier? harder? How quickly did you write your 200 words in each stage, was it noticeably different?