I recently went to a jazz jam and found really talented musicians playing (intimidated me right out of the building). I've only been playing 50 years with some jazz background as well. These guys were awesome. The bar was standing room only (obviously jazz fans). noticed not one and I mean NOT ONE bobbing head, tapping fingers, tapping toes, singing along etc. I wondered if these folks could "feel" one of George Thorogoods songs.
Just a couple observations.
Here's the scenario you describe: You went to a jazz jam where the players were awesome, and the place was packed. The people you saw were enjoying themselves. It was obvious to you that they came to listen, period, but you logged on here and said, "they didn't tap their feet, they didn't sing along with the musicians, they didn't bob their heads..."
You turned their positive listening (it's music, after all) experience into a negative because they weren't responding to musical stimuli the way you wanted them to.
Why?
You obviously haven't seen Pat Metheny's hair lately![]()
How recently? It's looked the same way for 30 years, other than getting grey.

