Thank you,
that accounts for the business end and mass production of digitally reproduced sounds.

Being a 'buff', I realize prejudices me on the topic. I've noticed how people react to some of the music both recorded and live. Live bands with only electrical amplification and 'engineering' resonate with people in noticeably strange ways. Recordings can as well STIR people and they often don't even notice until they're involuntarily or automatically responding to what they hear.

Two examples of recorded music never fail to get people absentmindedly 'moving', catching themselves and even feeling a bit awkward about it. I love to play one of them, a common standard, in bars on those internet 'juke boxes'. Benny Goodman's 'Sing, Sing, Sing'. Another, even though a bit scratchy is Henry Hall's BBC Dance Band's rendition of 'Anything Goes', can only find it on youtube. Street groups like Tuba Skinny and their all acoustic, varying ensemble also captivates passers-by.

The concert angle is probably a good way to 'get the pulse' on audience demographics to investigate if there is a strong movement away from the screaming and jumping around with guitars to sound beds or only short-lived fads. That the fads have been perennial and similar in their content could be a clue in itself. Rod Stewart's stab at it was well received and he did very little with phrasing or stylizing.

Sure would like to see concerts take-off. 'There is a place in downtown LA called The Cicada Club that is enormously popular with buffs and locals. It was built in 1927 and has been preserved. They feature period (20's-40's' ) and special genre groups to sell-out crowds.