I love those hard core music fan shows. I remember about 10 years ago when McLaughlin, Di Meola and De Lucia (The Guitar Trio) came around again.
Same type of scene, 90% guys, most wearing Fender T shirts or some other shirt saying "Look at me, I play guitar too". No one stands, everyone is dead quiet, and at the end of every tune everyone is just floored.
I had a sick experience a month or so ago at Radiohead here in Florida which was maybe the best concert I have ever seen. No one talking, dead quiet crowd, but everyone rolling their heads off and dancing. Kind of like a Phish crowd but everyone was on mute.
There are only two mantras. Yum and yuk. Mine's yum.