two kids TV commercials that caught my eye:
Burger King's Dance Dance Revolution
the Blue Man Group percussion toy
now i can remember going to see Blue Man Group in the early '90s when it seemed... not exactly underground but certainly some distance from mainstream, not that different from things like the Bow Gamelan Ensemble... the music played even sounded a bit Krautrocky or at least in the vicinity of Cul De Sac (whose Ecim just got reissued incidentally)
now they're an Xmas gift for tots, you can pound the percussion tubes while watching a video of the men in blue...