Covers.
Grab some free mp3s from Me First and the Gimmie Gimmies, a band that only does punk covers of easy listening songs like Mandy and Wild World.
See all the songs they've covered at The Covers Project.
While there if you click on a band that they have covered, you'll go to a page that shows all the bands that the covered band has covered, and also see a list of all the bands that have covered that band.
It's a covers party!
And if you like that, you'll also enjoy The Knockoff*Project. It features album cover spoofs, goofs, tributes, send ups, near misses and coincedences.