Three—that's the magic number. Rick Ross, Dr. Dre and Jay-Z proved this Schoolhouse Rock truism once more when they united on "3 Kings," one of the most memorable moments on Rick Ross's new LP, God Forgives, I Don't. But rap has a long history of three heads being better than one. Click on for a look at hip hop's greatest trios.
(Photos from left: Christopher Polk/Getty Images for Coachella, Astrid Stawiarz/Getty Images, Michael Buckner/Getty Images For BET)