These NYC multimedia subversives have just issued their strangest work yet-which is saying several mouthfuls, judging from past Gang Gang Dance efforts. Retina Riddim consists of a 24-minute CD and a 33-minute DVD. The former is amorphous psychedelic dub that sounds like Black Dice riotously improvising in Black Ark Studios. You don’t exactly know what’s happening for the disc’s duration, but you realize something of unearthly beauty has pierced your headspace, the frequently morphing rhythms and grotesque textures rendering reality an absurd abstraction. All in a night’s work for GGD, as the DVD proves-the first two minutes anyway; my copy has a glitch that makes it rewind at that point. But that glimpse was definitely dazzling.