On a serious note, since i'm bored.

Top 12 night: Billboard #1 Hits
Top 11: Indie night (no more over-done doom songs like "I Wanna Dance With Somebody", kthnx.)
Top 10: Broadway
Top 9: Whitney/Celine/Mariah night, so Randy and Simon can blow their brains out.
Top 8: Songs From Your Favorite Movie (<3 Letters to Cleo from 10 Things I Hate About You <3)
Top 7: Top 100 songs on iTunes
Top 6: Big Band (seriously, this theme is ALWAYS pwnage.)
Top 5: J-Pop/Rock <3
Top 4: 80s Rock
Top 3: Standard contestant's choice/judge's/producer's choice, yawn.