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?
So many great examples in this thread already, so I'm going to go with a simpler one: Guitar overdrive. intentionally increasing the gain beyond max input level of the amplifier to produce a more square wave tone would've seemed sacrilege to guitarists from the 30's and 40's.
And today it's the foundation of so many guitar sounds and music genres.