I am fed up to the TEETH of reading about thumb-over vs. thumb-under technique and wondering if I'm doing it right. I want to SEE SOMEONE DO IT.
Would someone who considers himself an expert in this technique please perform the following simple steps:
1) Obtain, buy, borrow video camera with sound. Make sure you get a good solid stand for it as you will be filming yourself, or work with a friend (make sure you pick someone generally competent and intelligent at physical tasks.)
2) Film someone else playing piano to learn where to best place the camera, and keep in mind that you want to see the action of thumb-over and thumb-under from several different angles. Keep at this until you obtain excellent visual information. All you're interested in is the hand, so get in close, and keep the thumb at the center of the screen. When the thumb-over action is going on, what does it actually LOOK LIKE? Get it clearly on the screen!
3) LIGHT THE AREA PROPERLY. This means, REALLY BLOODY BRIGHT, ok? Grandma's 60 watt light bulb won't do the job here. You want several of the brightest lights you can possibly get, placed so as to eliminate ALL shadows. Again, practice and test until you obtain satisfactory results.
4) Now that you're all set, film a number of bits of playing with thumb-over passages. (DON'T WORRY ABOUT THE SOUND QUALITY -- it will be good enough for this primarily VISUAL demonstration -- if you start to worrying about sound, believe me, it's a dark forest that has one entrance and NO exit.) Play them ROBOTICALLY SLOW, then a little faster, then a little faster, then at normal speed, etc. Demonstrate all the areas where the thumb-over technique is of particular value, where it's particularly difficult (to the thumb-under habitués), etc. Keep explanations to a minimum; Chang's covered that.
5) Edit out all the bad bits, and then digitize it (or have someone help you with that -- turn it into some kind of computer video format) and upload it somewhere, or tell me about it, I'll help you distribute it.
You'll be doing a tremendous service to piano-learners worldwide, and for very little effort!