Detroit is the fourth mixtape by American rapper Big Sean. The album was released for free download on September 5, 2012 by Kanye West's, G.O.O.D. Music. Detroit features guest appearances from fellow rappers 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 include 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, KeY Wane - among others. The mixtape consists of completely original songs.