Andrew W.K. is the most bad-ass, classically trained pianist you'll ever meet. Since breaking onto the scene with his 2001 debut, “I Get Wet,” blasting his introduction with a bloodied album cover and a frenzy of metal-pop tunes including “It's Time to Party,” “Party Hard,” “Party Til You Puke” and “Don't Stop Living in the Red,” W.K. declared himself a ringmaster of clean, fun insanity. Leaving critics scratching their heads with regards to whether he was playing parody or some kind of guilty-pleasure genius, the songwriter became a hit nevertheless for his enthusiastic live performances, regularly telling security to let audience members surge onstage with him in a pig pile of sweat and sing-a-long moshing. At one point injuring himself onstage, W.K. continued to tour in a wheelchair so as not to let down his fans (and partied just as hard sitting down). Appearing in his signature white t-shirt, white jeans, and white shoes (all of which become filthy by the end of each performance) W.K. is scheduled to perform at the Canal Club on Friday, Aug. 20, at 7 p.m. $20.