CeeLo Green is a musician.
CeeLo Green . Internationally , Green is best known for his soul work : his most popular was Gnarls Barkley 's 2006 worldwide hit `` Crazy '' , which reached number 1 in various singles charts worldwide , including the UK . `` 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 .