More than any other hip-hop group, Run-D.M.C. are responsible for the sound and style of the music. As the first hardcore rap outfit, the trio set the sound and style for the next decade of rap. With their spare beats and excursions into heavy metal samples, the trio were tougher and more menacing than their predecessors Grandmaster Flash and Whodini. In the process, they opened the door for both the politicized rap of Public Enemy and Boogie Down Productions, as well as the hedonistic gangsta fantasies of N.W.A.