I'm sure you always wanted to know....
FINALLY an explanation for my question regarding consonance vs. disonance! (I DID always want to know!)
The part at 6:30 ... harmonics.
Overtones - the reason for different timbres (pronounced "tambers") - answered a question before I even thought to ask it!
"Hey! Check it out!" Lots of geeky fun here. :-)
Fun to know stuff, but even those of us who don't quite get it all can still make music!
Our ears and brains are wonderfully made!