When I sit down with every student I ask,
"So how has your piano been?" Without even waiting for a response I can see in their body language if they have practiced or not. Then I hear them say,
"I did practice, a bit."
"What is a bit?"
"Oh I did 1 hour before the lesson today."
*I slap my forehead.
I think being patient is the hardest thing. When I teach beginners I have to be supremely patient. Uneveness of fingering in a simple scale or weakness of fingers while changing chords, these annoying but constant problems that face young beginners is a real test of my patients because to ME it is the most simplest thing in the world.
What really frustrates me though is when a student forgets how to play a piece that we practiced very hard on. I quickly abandon everything we are doing and try to patch it up again because afterall it is only a few notes which block the memory, not every single note. But it will become every single note the longer you let them have these memory lapses. This is like musical cancer in my mind, don't just forget about it, take actions to deal with it immediately.
Driving an hour to get to a students house for a lesson, then they ring you up 5 minutes before you reach their place, "Oh sorry we can't make the lesson today... followed by an excuse." Sometimes the excuse is perfectly alright, I had one student who fell and broke her arm as soon as I walked into the door! I wouldn't get angry because of that, but sometimes they say things like, oh there is a school meeting or some other meeting which I forgot about. Yeah nice, you could have told me before I make the trip! And damn fuel prices, its not like I enjoy giving money to petrol stations.
Parents which sit down and observe lessons, and make constant comments to me or their kids while I teach. This is fine if I have a lot of time to spare because I can stop and chat with the parents and then continue the lesson, but it is a big disruption. It is really bad when they start saying, "Come on! Focus!" Things which are supposed to make the children work harder but which of course do the opposite and annoy and irritate. Kids never like to be told what to do by parents in front of other people. Trying to teach musical details to an annoyed kid is impossible. I try to over praise the student when the talkative parent is there, more to shock the parents that their kid is doing it right, also to motivate the student to think, yeah see mum/dad I am doing it right, the teacher even says so, so stop annoying me.