We had a mixture of all sorts - I'm a cello teacher and DH is a guitarist & bassist, so we had a playlist of:
- Tchaikovsky: Variations on a Rococo theme:17.32
- Birthday: The Beatles:2.43
- Fruit Tree: Nick Drake:4.49
- Shelter from the Storm: Bob Dylan:5.02
- Cello Song: Nick Drake:4.48
- Blackbird: The Beatles:2.18
- Sittin' on the Dock of the Bay: Otis Redding2.55
- Chowdown: Corduroy:4.27
- Gimme some lovin': The Spencer Davis Group:2.57
- Green Onions: Booker T & The MG's:2.57
- Don't You Worry 'Bout a Thing: Stevie Wonder:4.45
which worked out fairly well, apart from the fact that the Tchaikovsky didn't quite see us through having the spinal done, so the Little Bear wasn't quite born yet when Birthday came on!
This time (ELCS4 in 2 weeks today!) I'll probably have a very similar playlist, but just shuffle it round and maybe have another short classical in there to bridge the gap between the genres.
For my first, (I was 23, and pretentious) I chose a Gregorian chant cd, which was fine until we were in there, on a Monday morning, and the staff had to change it over after 20 minutes because they were falling asleep!
2nd, (4 years later, still a bit pretentious,) I decided to have the Harry Potter soundtrack, which was fine, but a bit silly!
Music's such a personal thing though - I'd recommend going through whatever you find REALLY chills you out - I quite like a lot of hard rock/metal/emo from my old goth days, but wouldn't dream of having it in theatre as it raises my heart rate, and really doesn't sound appropriate for the situation!!!