Bone Thugs N Harmony "East 1999 Eternal"

They sold more than 15 million records. They recorded with The Notorious B.I.G. They recorded with 2Pac. They won a Grammy. They redirected hip-hop's sonic direction.

Only one rap group has these impressive feats on its extensive resume:
Bone thugs-n-harmony. Simply put, the Cleveland quartet is one of the most important groups in hip-hop history; breaking down doors for other Midwestern rappers; launching their successful Mo Thugs record company and introducing mind-splitting, rapid-fire rapping and angelic harmonies with melodic production to the genre.