A lot of writers who listen to music as they write have soundtracks for their WIPs. I have soundtracks for the manuscripts I edit.
For Adrienne by D. Renee Bagby, it was October Project.
For His Convenient Affair by Tricia Jones, it was a lot of Badly Drawn Boy.
For Inventing the Abbotts by Jerri Drennen, it was Goldfrapp.
For Possession by Mardi Ballou, it was the soundtracks for Pride and Prejudice (2005 version), Meet Joe Black, and The Last of the Mohicans.
For Ask Adam by Jess Dee, which is wonderful and fabulous and out today, I listened to Fiona Apple, Feist and Kelly Clarkson. (And I'm too lazy to link to them.)
Yesterday, I listened to a lot of A Perfect Circle (Orestes in particular) while editing a book I can't mention yet. :)
Other weirdness--I can listen to only classical music while finalizing (doing the last check for mistakes, putting into the proper format and adding excerpts) a manuscript. Anything else is too distracting.