Chapman and Blondie also used plenty of other little tricks on “Heart Of Glass”: digital reverb, multi-tracked guitars, echo machines, a Minimoog, Chapman’s own backing vocals. It’s a beautiful piece of recording, all these sticky and hazy interlocking pieces combining together into a sighing, rippling landscape. Parts of it — Clem Burke’s lockstep drums, Nigel Harrison’s funky and vaguely Chic-esque bass-pops — sound truly disco. Other parts sound like rockers in an expensive studio attempting to figure out how the Giorgio Moroder magic was made. The whole thing glimmers and flutters and fades like a mirage on the horizon. It’s beautiful.