I never would have picked up the coin tapping if you hadn't mentioned it. These folks are actually holding a pretty good beat, alongside the drink glasses indicative of some level of intoxication. I'll go now and look this up in Han's book. (Which I paid dearly for whilst it was out of print)
I previously didn't know that Bert was famous. Sorry, I thought that with the shiny outfit and toe-tappig music that it was a comedy or music parady act, like Wierd Al Yankovich, or something.
But what do I know? You learn something every day, and even more on LTG...
Craig