361. OutKast, 'Stankonia'
"We call it slumadelic," said Big Boi of OutKast's far-reaching blend of hip-hop, funk, rock and otherworldly sounds. "Ms. Jackson" was something new for rap: an apology to the mother of an ex-girlfriend. And "B.O.B. (Bombs Over Baghdad)" twitches to techno beats and screeching guitar.