Gnarls Barkley's first collaborative album, St. Elsewhere, was released on April 24, 2006, in the UK and May 2, 2006, in the United States. St. Elsewhere entered the charts at No.1 in the UK, as did the first single "Crazy". "Crazy" is the first single to reach number one in the UK based on digital download sales alone and is ranked by Rolling Stone as the greatest song of the decade, ergo making it Green's most successful project to date. A second album by Gnarls Barkley, titled The Odd Couple, was released in March 2008. Its first single was released in January called "Run (I'm a Natural Disaster)".