Music includes Debussy's 'Claire de Lune' for orchestra (however, I recommend finding a recording for piano).
Beside Grieg's 'In the Hall of the Mountain King,' from Peer Gynt, there is also 'Dance of the Mountain King's Daughter' which is heard over the opening of the play when John the Baptist is in the cage. You have to get the complete music for Peer Gynt (not just the suites).
I think there's also some music from Scriabin, but I'm not sure. Been a while since I've seen it, have to check it out now!