By Matt Diehl
Updated September 27, 1996 at 04:00 AM EDT

”When rap music began, most people thought it was a fad,” states the intro to illadelph halflife. On their innovative second album, the Roots prove doubters wrong by flavoring street beats with bugged-out rhymes and jazzy live instrumentation. Not that they need the help, but with guests like Q-Tip, D’Angelo, and jazz diva Cassandra Wilson, the Roots will have ”fans listenin’ from Michigan to Switzerland” (”Respond React”) in no time. A-