Music Video speed help

so i'm shooting music video in 12 hours , want use slow mo effect.  want shoot slow mo parts in 60fps , edit else in 24fps.  question is, how speed backing track artist play/sing in order sync correctly?  read 240% somewhere that's insanely fast , not possible comprehend!  please help!

it doesn't work that. camera shoots silent , audio either recorded on-set external device, or it's dub of studio track band miming playback.

More discussions in Premiere Pro CC

adobe