OK, here's the rules;
1. 4 MCs/Rappers from each decade.
2. No Repeats. So you can have Jay Z on your Mt Rushmore for the 90s or the 2000s but not both.
1980s - Melle Mel, Grandmaster Caz, Kool Moe Dee, Kurtis Blow
1990s - Ice Cube, LL Cool J, 2Pac, Biggie
2000s - Nas, Jay Z, Eminem, Ghostface
2010s - Kendrick Lamar, Rick Ross, Kanye West, Nikki Minaj