What defines a great rap duo? Awards? Chart dominance? How about chemistry? Or a fusion of these three? The is no definite answer as what makes a great hip-hop duo, the acts below have somehow managed to leave a last impact on the hip hop world. Here are the 10 greatest duos in hip-hop history. 

10. Blackalicious

https://youtu.be/IqqPyKumZqM

9. Mobb Deep

8. Dead Prez

7. Clipse

6. EPMD

5. UGK

4. Black Star

3. Gang Starr

2. Eric B & Rakim

1. Outkast