19. Milli Vanilli (1990): The Beginning of the End
Technically speaking, nobody won the Best New Artist Grammy in 1990 because Milli Vanilli gave up their trophies after it was revealed they didn't sing a note on their album. Grammy night was the peak of their entire career. Their performance of "Girl You Know It's True" sounded suspiciously like the version on the album, but nobody suspected a thing at the time.