How many 'live' performances, especially where the darling artist 'plays' an instrument at the same time, are actually either a backing track or somebody hidden behind the set dressing doing the actual playing.
I don't care how well marketed thought of you are, there is no way you're playing a C/G by plonking your immaculately manicured hand flat against the strings and effectively muting every single one of them - especially when the actual chord I can hear coming out of the PA/TV is a fucking E7.
How many performers are utter dicks, especially when they think nobody that matters can see them.
How many performers who come across in the media as utter dicks are actually absolutely lovely.
How 'fans' can be the biggest pricks of them all. And bloody scary about it.
When somebody's got a 'game face' on to disguise crushing anxiety and poor self esteem.
When somebody is under the influence of drink or substances.
When somebody is spoiling for a fight and who they've targeted for their attentions.
Crowd dynamics. Including how to not be squished or caught up in an incident/if the mood is changing.
When somebody is guaranteed to have a press story about cancelling a tour/concert for vocal surgery within a few years.
And where something has been overproduced/the vocals were obviously so shit that they've had to be manipulated beyond all recognition. Why claim it's a raw recording when unless you have more hands than a Hindu deity there is no way on earth you managed to play that number of things (notes, drums, sing three notes, etc) at once?