Super Bowl viewers were quick to pounce on Alicia Keys for botching a note during her Halftime show performance with Usher ... but her voice crack has since been cleaned up.
Alicia was a little off-key Sunday when she started singing "If I Ain't Got You" while playing piano onstage -- something people very noticed immediately and mocked her over -- although, you wouldn't know it if you missed the live show on air during Super Bowl LVIII.