One difference is that Pink Floyd made their entire careers on about thirty-five songs, iirc. That's about one season's worth of one symphony orchestra's reper

One difference is that Pink Floyd made their entire careers on about thirty-five songs, iirc. That's about one season's worth of one symphony orchestra's repertoire, and most performers perform with multiple ensembles to make a living. Does the wedding gig string quartet have their regular repertoire memorized? Probably. Does the orchestra have the premiere by a minor Midwestern composer memorized? No, and they never will.