That hasn't seemed to be a problem in the last few years.
The Rolling Stones were not lip syncing. They were actually performing
live. BIG difference.
Bingo. The last few times I attended a Stones concert, it was entirely
canned. Mick had to be very careful where he walked, how he gestured,
etc, as there were incidents where what you saw on stage from a close
seat and what was being shown on the monster video screens was not
completely in sync. The band could have phoned in sick, and most of the
show would have gone on anyway.
No excuse for screwing up "Start Me Up" or "Satisfaction" when you're
the Rolling Stones.