I just posted parts 3 & 4 of my YouTube mini-series on overtone basics.
PART 3: How overtones...
PART 4: Why overtones?
In them I discuss & demo the 2nd harmonic.
More importantly, though, I discuss HOW to practice them and the BENEFITS of practicing overtones...
I just posted the first two of four videos presenting the very basics of overtone production, intended for sax players who have never tried (or even heard of) overtones - but ought to know about them. :)
These videos are actually all 1 lesson, but I sliced into...