Detroit is the fourth mixtape by American rapper Big Sean. It was released for free download on September 5, 2012, by G.O.O.D. Music. Detroit features guest appearances from these fellow rappers such as J. Cole, Juicy J, King Chip, French Montana, Royce da 5'9", Kendrick Lamar and Tyga - along with track narrations by Common, Young Jeezy and Snoop Lion. Wale and Wiz Khalifa are also featured in the bonus tracks. American singers includes Chris Brown, Jhené Aiko, James Fauntleroy and Mike Posner. Production derives from Hit-Boy, Da Internz, 808 Mafia's own producers Lex Luger and Southside and KeY Wane - among others. The mixtape were consisted of mostly of these completed original songs.