This is great fun, Patrick. Thanks for posting it!
Yeah, but something's not quite right. I think they're foot-syncing to pre-recorded music.Most obvious in the beginning when the one girl steps on the high notes, then the other girl steps on lower notes, but the notes played are the same, not lower. Then the first girl steps on the lowest notes, but again, the notes are the same as before.
They'll be Bach, you be Liszt, I'll be Chopin. Sorry it was there had to do it.