Bey lipsyncs
almost every performance.

And not just talking a "backing track". Nothing wrong with it, if you're delivering an amazing show though. She just never slips up bar the Obama thing and some videos I've seen from Mrs. Carter Tour. And me and my friend were pretty convinced she lip-synced Why Don't You Love Me when we to OTR.
She certainly will tonight with the demand of a 15-20 minute medley, but it'll be a showstopper.