** Queen having an argument during soundcheck 1977 **
Brian May: I’m playing what I always play!
Freddie Mercury: You’re going ‘nyeh-nyeh-nyeh-nyeh-nyeh’
BM: I’m playing EXACTLY what’s on the record, Fred.
Roger Taylor: You do slow down…
BM: Oh fuck… slowing down.
FM: Well, you’re expecting ALL of us to be…
PHERfect, before you even ATTEMPT to
BM: Don’t be so fucking ridiculous.
FM: How’re you gonna do…?
BM: *plays a chord a few times*
John Deacon [from the background]: Take it down a bit.
RT: No, DON’T take it down!
BM: *repeats the chords*… That’s alright!
RT: Oh, I wanna hear it!
(Source: https://www.youtube.com/)