In 2006, Danger Mouse and CeeLo (as Gnarls Barkley) released their first album, "St. Elsewhere", which included the international hit single "Crazy". "Crazy" became the first UK number-one single based solely on downloads. Gnarls Barkley set out on tour and was one of the main opening acts on the Red Hot Chili Peppers' "Stadium Arcadium World Tour". The Gnarls Barkley touring lineup also featured future Chili Peppers guitarist, Josh Klinghoffer. He also produced two tracks on The Rapture's 2006 album "Pieces of the People We Love". In the autumn of 2006, Sparklehorse released his fourth album, "Dreamt for Light Years in the Belly of a Mountain", a collaboration with Danger Mouse and Steven Drozd of The Flaming Lips. In August and September 2006, Danger Mouse collaborated with British graffiti artist Banksy to replace 500 copies of Paris Hilton's album "Paris" in English music stores with altered album artwork and a 40-minute instrumental song containing various statements she had made.