For Beast Bait I don't have a specific playlist. Much like a lot of people here I can't listen to music while writing, but during the drawing itself (inking and coloring) I pretty much have to listen to music that I already know the lyrics to, anything with new lyrics might distract me. So I listen to the Smiths, Iron & Wine, Arcade Fire, or REM.
When I'm doing flatting or coloring, I can pretty much listen to anything, so I put on Pandora on my Decemberists station and listen to whatever comes up.
When it's time for lettering, I need to pay attention in case of rewrites so it's back to silence for me at that point.