Echoes and the Ping: How a Grand Piano String Launched Pink Floyd’s Progressive Era

The most famous accidental sound in early ’70s rock came from a grand piano in Abbey Road. David Gilmour was messing around with a Binson Echorec delay unit when he ran a lead from the piano’s internal pickup, then hit a single note and let the feedback loop create a rising, watery ping. That ping became the central motif of “Echoes”—a 23-minute suite that took up the entire second side of Meddle and marked Pink Floyd’s full leap into progressive rock.

Meddle itself was a transitional album. After the loss of Syd Barrett, the band had been groping toward longer, more atmospheric pieces (“A Saucerful of Secrets,” “Atom Heart Mother”), but “Echoes” was the first time their collective improvisation locked into a structured, multi-part epic. The ping ties the whole thing together: it opens the track, returns midway after the haunting vocal section, and closes the piece like a signal from the deep ocean. The song’s structure—quiet verses, explosive middle jam, ethereal vocal harmonies, and a slow fade into recorded whale songs—became a blueprint for Dark Side of the Moon.

Ironically, the ping almost didn’t make the record. The band recorded the piano loop by feeding a single note through a Leslie rotating speaker, then slowed it down and reversed it. Gilmour later said he had no idea that sound would define their new direction. But “Echoes” proved Pink Floyd could build a vast, cohesive world out of one accidental tone, and it convinced them to stop looking backward.