Chicago native Spectacular Diagnostics brings us his ultimate collection with “The SPEC Tape.” A longtime veteran of the underground scene, SPEC cooks up the type of tracks that only a master beat artisan can serve. His instrumentals blur the lines between straight boom bap, lo-fi weirdness and experimental sonic wizardry.

As if this subterranean musical journey wasn’t enough, he’s brought a star studded group of raps biggest and brightest talent along for the ride. “The SPEC Tape” includes everything from both of Spectacular Diagnostics previous releases “Raw Game” and “Avant Raw” plus the previously unreleased “3UP” EP, which features collaborations with Grandmilly, Koncept Jack$on, Al Divino, Flashius Clayton, Crimeapple and SmooVth.