Forgot about Tool. A bit different different since that is an explicit rule. No audio recordings either.

The Phish thing happened naturally and no one talks about it. Also different that, before the internet, they encouraged and sold 'taper' tickets so fans could trade shows (the Grateful Dead did this too I think?)

It's pretty common sense to respect others in the audience and not hold up a distracting bright screen. Shit, fans hardly talk when music is playing and very little sing along behavior.

LSD probably contributes lol