Go Home Productions, "I Can't Stand Sultans Of Swing" [download]
This mashup was sent my way by fellow Brat Dufmanno, one of The Police's biggest
Go Home Productions, "Smells Like Rockin' Robin" [download]
This one is a mix of Nirvana's "Smells Like Teen Spirts" with Michael Jackson's "Rockin' Robin." Of the three songs I've included in the list, this is the one that sounds the most like an actual song and not a mashup.
DJ Topcat, "Folsom Prison Gangstaz" [download]
I saved the best for last. Johnny Cash + Eazy-E = Brilliant.