Three states have accredited me to teach mathematics, earth science, and instrumental music and they prescribe the texts I'd be required to "teach" from at different levels and how I would categorize achievement ... by comparison to other students ... not to their own individual progress. Well, like a trumpet and most other endeavors, some can, some can't and some won't ... but still there are others that will never have the opportunity for various rationale reasons. Thus, teaching quickly vanished as my lifelong career field.
I'm now tutoring only 4 young 6th grade boys for their second year on trumpet and I'm using the same book series they use in their school instrumental music class plus some supplemental etudes I provide. Well, in class they have now begun book 2, but in the tutoring sessions I offer they finished that book last year and now are midway along in book 3. Too, I feel that 2 of the boys have begun to get the knack of sight reading music an element that I read here on TM that some trumpeters still lack.
Will the 4 boys ever earn a living playing trumpet? I really don't expect them to, but I hope they'll eventually enjoy music the rest of their lives as I do.