Excellent new weird-music blog Dinosaur Gardens (contributers include Mr Evolution Control Committee, and the guy from the great local (L.A.) Space Age theremin-a-go-go combo Seksu Roba) posted a 1968 recording by the father of Minimalist composition, Terry Riley, that just might be considered the first remix of a pop song: "...the proprietor of a local discotheque asked Riley to compose a piece to be played in his club, and Riley obliged — but with a version of Harvey Averne's "You're No Good", a single off Averne’s 1968 Atlantic LP Viva Soul..."
The result is 12 minutes of tape-looped lunacy, with sine-wave and Moogs thrown in here and there as well. Was this actually played at the disco? And did anyone dance?
And who knew there was a soul-man named "Harvey"?
Terry Riley "You're Nogood"