Gnarls Barkley is an American soul duo formed by singer-songwriter CeeLo Green and producer Danger Mouse. They gained international fame in 2006 with their debut album St. Elsewhere, featuring the hit single Crazy. The song reached number two on the US charts and topped the UK Singles Chart, earning a Grammy nomination and platinum certification. Their follow-up album, The Odd Couple, was released in 2008 to similarly positive reviews.