Mashups don’t come better than Danger Mouse’s 2004 effort, The Grey Album, which combined an a cappella version of rapper Jay-Z’s Black Album with instrument samples from The Beatles’ White Album. Completely unauthorised and deemed illegal, very few people have the promo vinyls that were initially pressed. You will not find it on CD or on iTunes (or maybe you can) but you know for sure that it can be found floating around in the deep bowels of the interwebs.

Find The Grey Album at your own discretion/risk, but almost as good as the audio mashup is a video mashup done for one of the tracks. Not the most polished video in the world, but I guess the idea was good.