K-ROCK Radio Mash-Up Holy fucking shit. They have a Lil Jon Vs. Metallica mash-up, as well as a NIN Vs. The Beatles. The NIN/Beatles one is funny. It's like "I want to fuck you... right now, over me". Hilarious. EDIT: Holy God they did a Johnny Cash/Nas one.
Some of these are pretty cool. I like the Marilyn Manson vs. Xzibit song. EDIT: limbizkit vs. Ludacris is cool too. Korn vs. Jay-Z is alright.
the station I listen to on Sirius radio does this all the time. IMO, they're just runing 2 songs by doing it