A timely comment was posted at my blog site which echoed my own frustration at times about teaching piano. Here's the spark for my current writing and it comes from a music instructor in Vancouver:
"I do have the odd students who don’t practice and never improve, and then get frustrated at their lack of progress. It’s been frustrating as a teacher because the kids are too young to understand that the reason they are not doing well is because they are not practicing, and the reason they don’t enjoy piano lessons is because they are frustrated.
