Who: Miles Davis
Why: People thought he was being ornery, but Miles said he was just listening to his band.
Who: Steve Albini of Shellac
Why: he spends ages tuning guitars or amps or something so they sound just right
Who: Davey Graham
Why: He had discovered DADGAD tuning and didn't want other guitarists to see what he was doing.
I wanted to post Status Quo on Top of the Pops where they start off with their backs to the audience, but I couldn't find it. Can anyone help?