The 9:41 audio documentary reveals some of the analog-era soundcraft and technology behind that magic, some of which was very new at the time. Endless loops and multilayered “aaahs,” a synth heartbeat in place of a drum, and hyperbolic chord overlays of some 256 voices, exhaling all at once. A Moog cathedral.
via The Making of 10cc’s melancholy ’70s Moog hit, “I’m Not in Love” – Boing Boing.
One of the former members of 10cc would eventually release a song somewhat less than unforgetable: