Gimme Shelter, best backing vocals of all times. Never surpassed as far as I know.
https://www.youtube.com/watch?v=ChONufP0FEs&t=94s&ab_channel=LaurentArnaud
One of my all time favourite pieces of music because of the guitar and the backing vocals.
Now i finally know (after listening for decades): it was #Merry #Clayton. Listen to her experience of it.
She lost the baby straight after the recording. Later lost both of her legs in a car crash.
