You’ve got Grandmaster Flash, Run-DMC, Miles Davis, Madonna, and Tupac in the Rock and Roll Hall of Fame. The confusion behind these inductees lies not with the quality of their work, but rather the categorization of it.
There are four other artists who have been nominated but have yet to be inducted—Afrika Bambaataa, LL Cool J, Eric B. and Rakim, N.W.A—and four more groups who have been considered for the ballot but who have not yet been nominated—Boogie Down Productions, De La Soul, the Sugarhill Gang, and the Treacherous Three.