But here Vengerov explain the sound he wants from the student. What do you think?
Yep, I like the way he approaches this - particularly his change of characters. Don't think the kid got it really. Electric Fingers is an interesting bit of teaching. No actual change in the shape of the bow hold, but the very thought that it's electric will make you hold it in a different way - and be able to apply first finger pressure to the bow in such a way to help the up-bow spiccato.
Cool! Exciting! A bit showy, but that suits the piece.
Tommo