" We were still quite short of material, and one extra encore found us with nearly nothing more to play: we plumped for ‘Echoes’. We were not that familiar with performing the song, and the piece sounded a little stilted – it was the last time we ever played the number. David now observes that one of the reasons we couldn’t quite recapture the feel of the original was that the younger musicians we were now working with were so technically proficient they were not able to unlearn their technique and just noodle around as we had in the early Seventies. "

― Nick Mason , Inside Out: A Personal History of Pink Floyd