The Grateful Dead, in their live sets, were doing a segment (later titled on albums and setlists) called "Feedback". It wasn't just some noisy crap at the end of a song thumbing their noses (think Neil Young with his longwinded, dissonant endings), but it was intentional noise and fucking with sound (later to be known as "Space" and not nearly as aggressive as in the early days). I believe it was as early as 1968, but it wouldn't surprise me to find out it was even 1967. You can hear it officially on Live/Dead, and the Feedback track was recorded 1969-03-02.* There used to be a website where you could look up things exactly like this, but it is gone.
*whoops...Anthem of the Sun bonus tracks, with Feedback present, are from 1968-08-23.
**unrelated, but 68-09-20 sounds a lot like a Muslimgauze release
***speaking of Lou Reed, I bet The Velvet Underground was messing with noise as early as 1966. A few of those New York minimalists probably were. Reed didn't come up with that on his own.