plunderphonics
Since remix issues often get treated as a late 90's or even post-millennial phenomenon, I thought I'd link up a few sources on Plunderphonics for future reference:
Plunderphonics, or Audio Piracy as a Compositional Perogrative, presented by John Oswald to the Wired Society Electro-Acoustic Conference in 1985.
The Man Who Stole Michael Jackson’s Face from Wired 3.02.
The Wikipedia entry on John Oswald, which traces his remix work back to the 60s.