The very idea of needing a technical term for the deviant act of singing someone else's song!

"Incidentally, the new song [= singer-songwriter] movement has so completely taken over the remains of the folk scene that I recently heard a friend say of someone who, like myself, is best known for interpreting material written by others, 'Oh, she only does "covers"!' I had a sudden vision of a CD titled _Pavarotti Covers Puccini_. Suffice it to say, Louis Armstrong did not do 'covers' nor did Billie Holiday, Bing Crosby, Frank Sinatra, Edith Piaf, or Aretha Franklin. While none of these people were primarily songwriters, their interpretations were a hell of a lot more original than a lot of the 'original' being written on the current scene. Any music worth its salt depends as much on great interpreters as on great composers. What is more, in the absence of interpreters, songs will never be sung by anyone other than their composers, and I cannot imagine why anyone would wish that kind of planned obsolescence on their work." -- Dave Van Ronk, _The Mayor of MacDougal Street_, <2005