Beyoncé and Jay Z together reached a peak of popularity that was difficult to surpass with Crazy in love, a 2003 song that on Spotify alone has accumulated almost 2 billion streams, more or less the same as Hey Ya!, by the duo OutKast, also from 2003. Another duo, Gnarls Barkley, spread the magic of Crazy around the world in 2006, and today it has a not insignificant 1.568 billion streams. Gnarls Barkley was an adventure of the New York producer Danger Mouse and the Atlanta singer CeeLo Green, each with their own career. The former had already produced Gorillaz albums and had shown boundless imagination in his own projects. CeeLo Green could boast a quite successful career, first with the hip-hop group Goodie Mob and then as a solo artist. But Crazy was a whole other story.