DJ Unk, the Atlanta rapper who scored a pair of mid-2000s hits with "Walk It Out" and "2 Step," has died at the age of 43.

Eric Carmen recorded 'Hungry Eyes' reluctantly, battled with Clive Davis over a comeback record, and more we learned about the late pop singer.

As the show celebrates its 50th season, look back at some of its most fiery, shocking and groundbreaking performances.

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