For me, it depends as who I am writing from.
For instance, I write listening to Taylor Swift, Blake Shelton, and Carrie Underwood when I'm posting as Chamaeleon.
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No, you did not see what I did there.

Yaotl gets to listen to Within Temptation, Disturbed, and even Adam Lambert. Jillian (I'd Give My Heart) is a good one when I'm writing. I may also throw on some Evanescence, maybe Three Days Grace, Apocalyptica, or even Billy Talent. For her I also bust out the wubwubwub, because the grittiness of the dubstep just talks to me.
For the OTHERS, which includes Leaf, I will listen to whatever is playing in the hopes of discovering a certain genre that gives me the motivation for them. I've listened to classical, metal, indie, opera, and even busted out some Nicki Minaj and Eminem. Leaf is more of a classical kind of guy, I've found from this experimentation.