I recently heard a song on the radio...2008 Remix--where can i get it?

i heard this song on kiss fm and it was a medley of all the popular 2008 songs put together into one with the beat of viva la vida. there was love song, i kissed a girl, so what, forever, disturbia, and many more....how/where can i get this song??? links to websites/iTunes/whatever is much appreciated!