Are singers required to lip-sync at the super bowl?!
Question: why?
Answers: why?
The noise from the stadium doent do well with their mic. They prerecord a few days before and "gate" the mic duiring the performance. Gating a mic means that they have it off during singing parts, but open the "gate" to it so the singer can say things like "Thank You!" and such, thus selling it as a live performance.