I don't listen to music while coding or writing very often, unless someone else in the office (yes, sometimes I have guests staying here) is listening to something in another room.

When I do, though, I spend a lot of time with Over the Rhine. Classical is good, too. Baroque (like Mozart, Vivaldi, Handel) would also work.

The trouble is, stuff breaks my concentration. Arguments against moving the TV out of my office, I guess.

Update: jlp takes issue with my classification of Mozart as Baroque. Defining the periods of musical history is always controversial (ask if Beethoven was Classical or Romantic sometime).