Goodie Mob (Split: 1999 | Reunited: 2006)
Why They Broke Up: Unhappy with the direction of their World Party album, which featured TLC on the attempted crossover single "What It Ain't," Cee-Lo left the group to record a solo project, which prompted the scathing title of the remaining crew's 2004 album One Monkey Don't Stop No Show. Get it?
Why They Got Back Together: After Cee-Lo found success with Gnarls Barkley and everyone else realized their solo prospects were not gonna happen (Did that Gipp & Ali album really happen?), the original foursome made amends and started making surprise appearances, officially announcing the reunion on Atlanta radio in 2007. Since then they've embarked on a full-fledged reunion tour and rumors about a new album in he works keep popping up.