6. Beastie Boys, 'Paul’s Boutique' (1989)
It's hard to imagine now, but nobody expected a thing from the Beasties' second album, because everybody assumed Licensed to Ill was a one-shot joke. But as soon as it dropped in July of 1989, Paul's Boutique became an instant classic of psychedelic hip-hop, with copyright-crashing sample wizardry from the Dust Brothers. "I realize we were supposed to come out with 'Fight For Your Right To Party, Part Two' and fall on our faces," Mike D said at the time. "Sorry to disappoint everyone." Rest in peace, Brother Yauch.