If you think about it, you teachers could teach via the internet.
With DSL, a piano cam and sound, you could get away with it.
Only the student would be on camera, and that's fixed mostly on the hands,
but sometimes you scan to check for posture, no boogers in his nose, no cigarettes in his mouth, no booze in sight, shoes on his feet, teeth in his head, elbows halfway up his arms, and so on.
Once in awhile you actually listen. But when you hear his fingers hitting all the wrong notes, you turn down the sound.
At the end of the lesson you turn the sound back up, give him hell, he PayPals you 50 Euros, and it's on to the next idiot in the queue.
You never had it so good!

I missed my calling.