15. LL Cool J
LL's longevity has never been disputed--he hasn't been able to "Live Without His Radio" since 1985--and, unlike some of his peers, Cool J has managed to reinvent his style over the years to reflect the current cultural landscape.
Best Album: Mama Said Knock You Out
With his dark and dystopic recitals, Eminem is always as willing to lacerate others as himself. His intricate rhyme structure, experimental wordplay, and meticulous phrasing make him one of the landmark MCs of the 21st century.
Best Album: The Marshall Mathers LP