CeeLo Green is a musician.
CeeLo Green . In the United States , `` Crazy '' reached number two on the Billboard Hot 100 . `` Crazy '' is the debut single by Gnarls Barkley , a musical collaboration between Danger Mouse and CeeLo Green , taken from their 2006 debut album St. Elsewhere . The song was leaked in late 2005 , months before its regular release , and received a lot of airplay on BBC Radio 1 in the United Kingdom , most notably by radio DJ Zane Lowe , who also used the song in television commercials for his show . Gnarls Barkley is an American soul duo , composed of singer-songwriter CeeLo Green and producer Danger Mouse .