Adam "MCA" Yauch's death leaves a Beastie-size hole in pop music. Though the trio were not the most prolific legends on the landscape (over the course of 25 years, they released only seven proper albums), their impact has been gigantic. Starting with 1986?s "Licensed to Ill," the Beastie Boys rewrote the rules for commercial hip-hop, the mainstreaming of hardcore punk, the state of sampling, and the treatment of the old school.