How Pink Floyd’s 1970 collaboration with Ron Geesin on ‘Atom Heart Mother’ pushed rock orchestration beyond the Moody Blues and ELO (and why the request’s date is off by five years)

First thing: the date in the question is wrong. Atom Heart Mother came out in 1970, not 1975. By 1975 Pink Floyd were finishing Wish You Were Here — a very different beast. But the collaboration with composer Ron Geesin on that 23-minute title track was genuinely groundbreaking, even if the timeline with other orchestral-rock bands is messier than the question implies.

The Moody Blues had already used a full orchestra on Days of Future Passed (1967), and ELO was literally founded in 1970 to blend strings with rock. So Pink Floyd didn’t invent the concept. What Geesin brought was something weirder: a collage approach where the orchestra wasn’t just backing the band but acting as its own sculptural element, with brass stabs, choral passages, and tape effects woven into the band’s normal live setup. The result was less “rock with strings attached” and more a single, sprawling electronic-orchestral suite.

That template — treating the orchestra as a textural collaborator rather than a sweetener — later influenced progressive bands like Yes (on Close to the Edge) and even some of the more ambitious moments on Pink Floyd’s own Dark Side of the Moon (via Alan Parsons’ engineering). It didn’t directly shape the Moody Blues or ELO, who already had their own formulas, but it proved you could do rock orchestration without playing nice. You could let the strings fight the guitars.