Oliver Wang reviews EBP on Vibe FM's blog Beast From The East

At this point, you'd think every possible concept for a hip-hop mixtape would have been exhausted but credit New York's Doc Delay for coming up with one that few would have thought of doing before. On Eastern Block Party, Delay uses 1970s hard rock albums from Czechoslovakia, Poland, Hungary and other Eastern European countries (Eastern Bloc/Block, get it?) as sonic fodder for a series of rap remixes. The result accomplishes at least two things: 1) it provides a very unique sound bed, a welcome diversion from the conventional spate of American hip-hop production conventions and 2) it also introduces folks to the depth and remarkable ferocity of Eastern European rock records from that era.
I'm by no means as hardcore a collector as Delay is but I've dabbled in Eastern European funk/rock scene and you'd be amazed at how huge the potential catalog can run. In Poland, labels like Muza and Polski ran ridiculously deep, covering everything from hard, metal-edged rock, to bossa nova, to big band jazz. Likewise, in Hungary, it was the Pepita label that seemed to draw the interest of bands who seemed to like nothing more than shred some guitar and crunch down some beefy breakbeats. Fans of early Sabbath or Iron Butterfly will no doubt hear the influence but these groups had a distinctive sound all their own too. You can imagine how much fun Delay had in running through dozens if not hundreds of potential albums to pull sample material from (I should note that while the pacing is brisk, he often lets songs play out for a few minutes rather than just offer up 2-4 bar loops).
His tastes in hip-hop acapellas run no less eclectic; there's everything here from the obscure Constant Deviants' indie hit from the mid-90s, "Catch a Speedknot" to JVC Force's ode to the L.I., "Strong Island" to Bone Crusher's "I Ain't Neva Scared." Given that the Eastern Euro sound can be completely different from the beats you're accustomed to hearing with, say, Kool G Rap's "Men at Work," the effect can be a bit discombulating at times and to be fair, some match-ups are better than others but the best pairings tend to slap together aggressive rhymes with rock riffs that can match in intensity and raucousness - the songs above were chosen explicitly to showcase that synergy.
All this and liner notes by the New Yorker's Sasha Frere-Jones. Like whoa.
For more info, check out this informative interview with Delay at The Fader's website.