I think they have fun, occasionally messing with each other and/or the audience in subtle ways. I had tickets to one of their shows but unfortunately had to miss it.
Maybe next time.
Some other fun ones by them:
- Sweet Child O’ Mine, New Orleans style
- Livin’ on a Prayer, Vintage Jazz style
- Timber, 1950’s Doo Wop style
and of course, for the gullible but still classy: - Vintage Soul