I've been wondering about this for some time. The trivia question is:
What or who mixed the first song that faded instead of a hard ending?
I'm guessing here, but from listening to old albums and thinking it through, I'd imagine that early recordings all had hard endings, as a live performance would. At some point, someone decided to fade the ending of the song while it repeated, most likely the chorus. I've wondered who that was and how it came about. Also, I'd imagine the first time it was heard it was quite shocking. While we take it for granted, back in those days it would have been something entirely new.
Any ideas?