Before my son was born, I got advice from several sources to bring along CDs of soothing music to listen to during labor, with specific suggestions like classical harp music. My husband and I had far more fun coming up with a list of inappropriate songs to play. We didn't think of enough to fill a mix CD, but we did get some good ideas:

"Baby's On Fire" - Brian Eno
"I Want My Baby . . . Dead?" - New Bomb Turks
"Drinking for Two" - Mudhoney
"Hung Up and Hanging Out to Dry" (specifically for the lines "Let's keep the afterbirth/and throw the kid away) - Julian Cope

I did bring my own take on soothing music, artists like Stereolab and Tom Waits. When the going got really tough, Night Song by Nusrat Fateh Ali Khan effectively alleviated some of the stress.