I'm with the second group, especially the mood-related music. I get on a sort of song kick and will listen to one or two songs on repeat. This would drive anyone else in my family insane if I ever lost my headphones.
The song of the moment, geared very well for my second draft, is "How You Remind Me" by Nickelback. I will literally play this song dozens of times on a loop while I rework scenes. In fact, I'm listening to it as I write this blog post.
There is nothing particularly inspiring about the song itself, but it reminds me(no pun intended) of my male lead character, as well as the overall process of rewriting this story. The most appropriate line for the rewriting process: "are we having fun yet?"