Hi
I can cite an example of high quality, professional teaching that happened to me today. My regular teacher isn't that well qualified as she's only a grade 8 Pianist, and a diploma level Viola player. However she is a perfect fit for me as my deficiencies are very obvious from my decades of non-classical playing. Last year I passed my ABRSM grade 7 with distinction, so clearly whatever she's doing is working.
Her husband though is on a different level. He's played major works with Orchestras and although not very active over the last few years, he has played at concert Pianist level.
Today, I had a lesson with him, with my regular teacher watching on from the wings.
It was a revelation for me in many ways. Aside from some obvious technical things for the specific piece we worked on (a Scarlatti sonata for my grade 8), it was the more general aspects of playing that made me realise how much I still have to learn.
The lesson though, was all done with a smile, and good humour. I didn't feel intimidated and I wasn't made to feel like I was an inferior person. So at some point in the future I will certainly have another lesson with him. When I got home from the lesson I wrote out a whole page of notes based on what he told me. A wonderful experience.
Now admittedly I'd known him for 18 months prior to today's lesson, and talked to him at some length about music, so I wasn't surprised that he had a lovely attitude when teaching. And of course if he'd been unpleasant, his wife would have lost a student!
Cheers