Hip-hop's history might be strewn with many more notable groups than duos, but time and time again, a couple of guys are able to come together and blow everyone to smithereens. So many great twofers have existed in rap: Eric B. & Rakim, Outkast, Blackalicious, Atmosphere, and Gang Starr.
Mos Def & Talib Kweli Are Black Star and Wu-Tang Clan's Enter the Wu-Tang (36 Chambers) are both classic debuts released in the '90s that have little in common. One is a two-piece collaboration that calls for peace, the other a nine-piece collab that features multiple examples of MCs waving guns around. However, these two landmarks do share a taste for variety.
With all this said, good news is on the horizon. In an interview last month, Kweli said that a second Black Star record will probably come out next year. Mayan Apocalypse be damned, 2012 can't come fast enough.