I love listening to SomaFM ‘doomed’ when I play. It would be really cool if when you turned on the MP3 player or radio in the game if the actual online station would ‘turn-on’ and play through your speakers; assuming of course that internet connectivity existed.
I usually listen to some old music from the Fallout: New Vegas radio tracks. I kinda also think that the background music (no radio music) seems somewhat appropriate, particularly the eerie whispering sound that plays every once in a while.
Personally, I don’t normally play music when I play DDA, primarily because I don’t have any music that would seem appropriate for the setting.