Instead of easing into the song with the first verse, Keys skipped straight to the chorus-and right on the dramatic opening note, her famously velvety-smooth singing voice noticeably cracked.
Talk to professional singers or voice teachers, though, and any glitches or postproduction fixes are less remarkable than the fact that, unlike so many Super Bowl halftime performers, Keys dared to do it live in the first place (rather than simply lip-synch).
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