Music used to grab people and shake people. Today, as you say, having people stop and listen is NOT what it's all about.
Is this it? https://www.youtube.com/watch?v=yogkBsWNE1g
@ Monterey Pop Festival 6/67
Haven’t seen Mama Cass yet, if this is it, but I can tell you that at 1:14 she’s so into it that she’s kicking her shoes off.