I had no idead that Guns n' Roses was filming last year's residency at the Hard Rock in Vegas, much less that it was being documented in 3D but here's the proof: "Paradise City" from APPETITE FOR DEMOCRACY.  I think this is plenty of evidence that Axl should just lip-sync.  I challenge you to watch more than 90 seconds of this before you have to turn away.  It's kind of like a rock & roll Two Girls, One Cup.