Thanks for the challenging question, Rachel. I'm more of an editor than a shooter, but I hope I can help.
At the 20,000 foot level: you'll have to adjust the speed of the clip to some extent by using Time Remapping or standard Speed effects. Twixtor is often used in more advanced speed tricks like you describe.
This topic is kind of a black art. It depends a lot on the footage, and whether you shot the footage to take best advantage of the music: shot over or undercranked, or even having playback at the set. Altering speed of the playback, then shooting it at a specific frame rate is another trick I've seen. Sometimes you have control over all these things, sometimes none of these things.
We need more info on your goals, or else we'd be guessing as to what you want to accomplish. Some sample footage might help too. If this is more of a general question, than I hope others can shed light on resources and better tips on getting started.