Following last year's Drone Activity in Progress convocation, Red Bull Music Academy ups the ante with this insanely ambitious sequel, bringing together marquee names from the worlds of metal (Napalm Death, Gnaw), electronic music (Tim Hecker), noise (Wolf Eyes), free jazz (the Thing, Joe McPhee and Chris Corsano), hip-hop (Gunplay) and more. Considering the insanely low price tag, this one's unmissable for fans of harsh aural esoterica.