The first time I had an amp distorted and loud enough to cause feedback (if I wanted to) at band practice was the most magical day of my life.

I had heard it a lot in punk and pop-punk to create swells. I improvised my still-favorite solo that day.

I wonder if tube harmonics modeled by solid state settings has shaped music. Of course it has; music from that era is instrument-oriented.

The discovery of feedback tones and the resulting incorporation in the musical experience — a three hour warm bank of tubes turned up to the limit with a maxxed out savant unlocking new realms of sound.