i have heard that various people did not have their instruments plugged in for live performances (sid vicious, richey edwards).
John Deacon can be seen at Live Aid and on Queen's 84 and 86 tours singing backing vocals, but the sound engineers were apparently told to make sure his mike was kept turned off.
There is a YT clip of on occasion when his mike stayed on...
I don't think he's a bad singer, but his voice definitely didn't fit in with the harmonies of the other three.
Also, you know that tambourine that Stevie Nicks was always playing? It has been said that a roadie would tape the zills together to muffle the noise as Ms Nicks' sense of rhythm was not quite perfect...
I do recall hearing of Motley Crue touring with Ozzy Ozbourne. At one point Ozzy dared of the Crue members to go outside and have a pee in front of an old lady stood at a bus stop. Mortified, but not wanting to be outdone by Ozzy he proceeded to do so. Ozzy was a bit miffed that he had actually gone through with it. So he ran outside and started drinking it!
I have head an interview with someone from Motley Crue where they described what happened - they hadn't met Ozzy yet and Nikki Sixx desperately wanted to impress him, so decided to urinate on the floor of his hotel room when Ozzy entered then lick it up.
Ozzy arrives, Sixx passes water, but before he can get the chance to bend down, Ozzy himself drops to the floor at licks it up.
I think this was the same tour where, lying next to an outdoor swimming pool, Ozzy spotted a line of ants walking in single file, and snorted them up his nose.
GG-Alllin, heroin addict, punk rocker, scooped up his own crap off the stage and into his mouth so he could spit it at his audience, sometimes physically assaulted his audience, both male and female .. usually performed nude..
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I saw a clip of GG Allin once where he had self-harmed and done a jobby onstage, and somehow got said jobby smeared all over his naked, tattooed body. A riot broke out in the club and Mr Allin ran out the fire escape into the street, and tried to stop a taxi. Strangely enough, no taxis seemed willing to stop for the shaven headed, tattooed, heavily bleeding, excrement smeared gentleman.