Mumble C

Marc Costanzo
Born	(1972-08-01) August 1, 1972 (age 45) Montreal, Quebec, Canada
Origin	Toronto, Ontario, Canada
Genres	Alternative rock indie pop rap rock hip hop
Occupation(s)	Record producer artist musician songwriter
Instruments	Vocals, guitar
Years active	1991–present
Labels	Funtrip No Work Sony Music EMI Virgin Dreamworks
Associated acts	Sum 41, Len

Marc Costanzo (born August 1, 1972) is a record producer, artist, musician and songwriter from Toronto, Ontario, Canada.

Born in Montreal to parents from Italy, he relocated with his family to Toronto in the early 1990s.

Costanzo is the lead vocalist of the alternative rock band Len, of which his older sister Sharon is also a member. He has written several hit singles, including Len's international hit "Steal My Sunshine". He has been both Senior Creative and A&R at EMI Music Publishing, and is responsible for signing many multi-platinum acts and writers, including Deryck Whibley from Sum 41 and Junior Sanchez. He has won several awards, including three MMVA awards as a Music video director, two as an artist, a Billboard Music Award, and several ASCAP awards as a songwriter.