I am a big fan of Enya! I walked down the aisle at my wedding to her music. For my labor, I liked Michael Flatley's Lord of the Dance. I found it soothing yet upbeat at the same time. It inspired me to get through 24 hrs (and 2 min.) of my labor. My neighbors probably thought I was crazy because I was walking outside breathing through my labor while blasting Lord of the Dance. Now everytime I hear the music, I smile and think fondly of that day.
For my second birth (I was induced), I listened to hypnobirthing cd's on a portable cd player with headphones. I highly recommend looking in to hypnobirthing!!! My second labor was much easier than the first, even with petocin. The cd's are fantastic!!!
Also, there is a musician that I heard while in Palm Springs at a fair. His music was so amazing that I had to buy his cd (and I do not normally do that). His name was Frederic Delarue and the cd I bought was called "A Mind Like an Ocean".
Please check out the website: http://www.fredericdelarue.com/homepage.html
Also, anything by Secret Garden is beautiful!
http://www.secretgarden.no/
I wish you happy, healthy birthing!