The clip is a treasure. Hancock relates a story from his Miles Davis days, in which he hears himself play a chord “…that was so wrong, I thought I had just destroyed everything, and reduced that great night to rubble.”
In short, Miles, without blinking, saved the “wrong” chord with his own playing, and it took Hancock years to figure out how that had happened. What at first seemed like pure “magic”, he eventually sorted out this way:
Here’s what happened.
I judged what I had played.
Miles didn’t. Miles just accepted it as something new that happened.
There’s more, but that’s the crux. Here’s the same clip on YouTube:
Marvelous. So marvelous I’m not sure it in any way diminishes the “magic” to realize how Miles did it. (Actually, I’d argue that you can hear that, in Hancock’s humility, as he tells the story.) And what a great reminder that any musician’s greatest tool is and always will be his ear.