Mash-ups. From The Grey Album on, they've become THE calling card for struggling producers trying to make their mark. Personally, while I love stuff like this, mash-ups, are for the most part novelty acts. Q-Unit have thrown together 50 Cent and G-Unit with Queen and the cover art alone is worth the download. Get ahold of it before the C&Ds start arriving wherever in The Netherlands this stuff is cranked out of.