Adam Yauch might have best explained what the Beastie Boys were, and weren’t, in their 1980s prime: “Hey, we’re not exactly angels.”Yauch, the once-rowdy rap trio’s MCA, died Friday after an almost three-year battle with cancer, the Beasties’ reps confirmed. News of Yauch’s death was broken by longtime friend Russell Simmons, the music mogul who served as the Beastie Boys’ mentor and original manager. It was Simmons’ Def Jam label that released the group’s 1986 debut album. More than a breakthrough for the Beasties, Licensed to Ill was a breakthrough for hip-hop, becoming the genre’s first collection to top Billboard’s pop-album chart. In the 1990s and beyond, the Beasties joined the ranks of rap’s elders, and won the first of their three career Grammys.