Marc Costanzo is the co-lead singer of a band called Len. His sister Sharon, better known as "Shar" also sings with him. Even though he still with the band, in the making of a new album, he is a producer of EMI Music Canada, working with a band called Liar Liar. For a while, he was a guitarist for the higly profilic pop/punk Canadian band Sum 41 when they didn't have a guitarist back in 1998. He left the band just before he went with his duties for Len's first major label debut album "You Can't Stop The Bum Rush". Len is a Canadian pop music group famous as a one-hit wonder for their song Steal My Sunshine in 1999. ... For the 1979 song by M, see Pop Muzik. ... Punk is a subculture, alternative culture, counterculture, a scene and youth culture based on a shared set of styles distinct from those of popular culture and other subcultures. ... Sum 41 is a Canadian pop punk band, from Ajax, Ontario. ...