After the out-of-nowhere success of Licensed to Ill, the Beasties had to prove they were more than one-album wonders, and they hit it out of the park with this follow-up. The Boys' lyrics are a hysterical deluge of cultural allusion (Ponce De Leon, Sadaharu Oh, and Love Connection's Chuck Woolery all get name-dropped), compressed wordplay, and adenoidal snottiness, but the real stars are the Dust Brothers, whose production is a hip-hop landmark. Their music tracks sound like the history of rock and funk radio boiled down to a pure concentrate--monster jams built out of thousands of unexpected samples (Johnny Cash! The Sweet!). It's a killer party album, kinetic and dense, and it never slows down. --Douglas Wolk