I searched the archives on this and didn't find much. In this thread Ewen shares research on cows and music:
He also shared that Ted Nicholas found that Mozart helped his copywriting students write better.
I like to play KUSC, a classical music station here in town. I don't know anything about classical, but other music takes me out of the copywriting zone, if you will.
What about it? Anybody cranking AC/DC, Tupac or Chubby Checker when writing copy?