Tracking the arc of A Guy Called Gerald’s career is sometimes like reading a history/primer documenting the cutting-edge UK dance music culture, and for a good period of time, he had an unerring knack for doing the right thing at just the right moment. But he’s never quite again reached the heights of his ‘90s jungle phase, of which Black Secret Technology is the pinnacle, a remarkable album that fully embraces the possibilities jungle affords producers when it comes to psychedelicising the breakbeat, making it porous, warping it, sending it firing out in different directions. There’s beautiful, lambent texture here too, and with “Finley’s Rainbow,” a bona fide pop moment; but the core of the thing is Gerald Simpson’s ability to make rhythms turn in on themselves and spiral like helices.