I’d be very interested to hear the response you get.
I didn’t complete the full course of piano grades here in Ireland. I only completed four of eight before losing interest in the piano, but my fiance completed the full courses for both piano and violin and has her performance diploma in violin.
I totally agree that distinguishing between the two problems here is critically important. I’ll ask her about the violinists’ approach to problem 1. I have a suspicion that what typically happens is that students who don’t intuitively “get it” just get frustrated and self-filter or flunk out of the grading process.
Also, I think it’s super important to clarify what we mean by speed. We tend to conflate notes per second with movement frequency, but they’re absolutely not the same thing.
Pianists and violinists score highly on the notes per second count. Much faster than the average guitarist (though significantly slower than the fastest guitarists). I haven’t seen anything to suggest that pianists or violinists are demonstrating particularly high movement frequencies.
On the other hand, drummers absolutely demonstrate very high movement frequencies. It’s actually a pretty shocking. Every drummer is fast. Fast drumming is totally normalised. We’ve all heard it our entire lives.
Guitarists the world over are struggling to pick a few bars of 16ths at 200bpm. Any competent drummer can play single stroke 16th note rolls at 200bpm. They have two hands, one stroke per hand. We have one hand, two strokes per hand. It seems like we should be roughly comparable, but the average drummer is much faster than the average guitarist.
When it comes to training movement frequency in music, I’m following drummers.
Of course, high movement frequency isn’t the full story. High movement frequency in stringhopping is still slow in a note per seconds sense, essentially achieving only one note per movement cycle instead of two.
There are other ways (with both hands) of achieving more notes in the time without increasing movement frequencies. Some of it is just combinatorial (picking and fretting sequences) and some of it is based on movement “hacks”, almost like instrument specific musical sleight of hand.