The Blue Man Group have made millions filling theatres for over a decade with their version of performance art. Intel ads and Vegas shows attest to the fact that yuppies have time and money to burn, and these bald-headed blue-painted New Yorkers are straight-faced laughing all the way to the bank. To put you off the scent of the perpetually boring beats they whack from PVC pipe, they've added some pop vocalists - namely Dave Matthews, Tracy Bonham, Josh Haden, Esthero and Gavin Rossdale - to sing you through your latest midlife crisis. The celebs manage to convince you only that they either owed some corporate execs a serious favour or wanted a piece of the big Blue pie. Live, Blue Man Group have a palpable appeal, like their peers River Dance and Stomp, but without the visual aspect, the audio is excruciatingly painful. Any novelty quickly wears off. Blue Man Group play the Air Canada Centre Wednesday (July 9), with guest vocalist Tracy Bonham.