* AdaptationDisplacement: "Richard Cory" (the song) is much more well-known these days than "Richard Cory" (the poem by [[http://en.wikipedia.org/wiki/Edwin_Arlington_Robinson Edwin Arlington Robinson]] that the song is based on).
* CoveredUp: "El Condor Pasa (If I Could)", which is just Simon's lyrics sung over the Los Incas version of the Peruvian folk song "El Cóndor Pasa" by Daniel Alomía Robles. Similarly, "Scarborough Fair/Canticle" adds new lyrics sung in counterpoint to the original folk ballad.
** Robles' son sued Simon and Garfunkel in 1970 to gain a writer's credit for "El Cóndor Pasa", but noted that the court case itself was friendly since the oversight was the result of Simon being misled to believe it was a traditional folk song, and has stated he bears Simon no ill will. Los Incas similarly did not mind the fact that their instrumental backing had been used without permission, and even became friends with Simon and had him produce their first English-language album.
** Happened in the other direction with "Hazy Shade of Winter" after TheBangles' version became a BreakawayPopHit.
* CrowningMusicOfAwesome: "Cecilia", "The Boxer"... Heck, let's just include most of their catalog.
* EveryoneIsJesusInPurgatory: Tons of interpretations of "The Boxer" say that its refrain of "Lie la lie" means something significant (e.g.: that the singer is actually lying about his whole tale). PaulSimon has gone on record as saying that he just couldn't think of [[SingingSimlish any words to sing there]].
* NightmareFuel - "The Sun is Burning"
* StuckInTheirShadow - Art Garfunkel, former TropeNamer for "LesserStar."