We shot this video last year using a mixture of 12fps, 23.98, and 48fps, so we could mix high speed, slow mo and a "normal" timebase.
I did a basic 2x speed up on the music track for the 48fps, but I didn't feel like it mattered that the math be exact. I think the audience forgives a little slip, as it's being slowed. However, I did make sure to give the band the 2x sped up track a week in advance so they could practice. I felt like this was extremely important. And it certainly made a difference when we were shooting, as they were prepared for how much faster they would need to perform and sing.
Hope this helps...
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