I can still remember Gonjasufi’s first single, clear as day. It was a proper sit-up-and-listen moment. Since then he has been quietly knocking out the goods for Warp, albeit slightly under the radar. Back with his fourth album ‘Callus’ (how did that happen?!) the US producer-vocalist and Low End Theory protagonist once again unleashes his trademark brand of dark, dense, heavy and politically-charged psychedelic soul.