Classic bop recordings + the Wu-Tang Clan?
This is one of those rare mash-ups that works just as well as one would like. What makes it click so well is that it's not just a bunch of one-bar loops with some a cappellas (hyperlink leads to some etymology that I found mildly interesting) slapped on top. Rather, the beats are constructed in such a manner as to compliment the vocals fantastically.
Bonus points for how many of the samples you can recognize.
Extra: Logan Walters designed the series of covers which inspired this album. Check out his page for some other equally-wonderful graphic design.