Proto-hardcore, you know the score: This 35-minute set, recorded in April 1990, is totally ebullient, a glowstick-waving bridge from hip-hop to euphoric acid house to blitzkrieg early rave. Acid bass lines are coming to the fore and are crossing with heaving breakbeat loops, the shout-outs from the DJs are murmured with fervor, and the future sounds about fifteen feet away.