When athletic height jumping was considered done and perfected, there was the Fosbury flop which opened new possibilities. Do you think there was such a moment in the music history? When someone showed how things can be done and from there everyone is using his/her technique?
Probably when some people started using the studio as an “instrument”, like Phil Spector with his Wall of Sound, or Brian Wilson of The Beach Boys during the Pet Sounds sessions. Never before had music sounded so good and rich in sound.