I listened to "Wish you were here" by Pink Floyd. (I know sounds corny!)
I had a cd case full of different stuff, and my labor went so fast and intence that I just said "put anything in!" and whoever it was chose that. It REALLY helped me focus and work with the contractions. During one very intence moment (did I mention it was intense!

) The music stopped and I was like, woken out of a trance, my midwife asked what was wrong and I said I NEED that back on!! Everyone got a kick out of it and laughed...sorry didn't mean to ramble!