Once upon a time, Wayne and I had a learning-experience with Isaac Stern. We learned......absolutely nothing. The following quote is from Wayne's website:

"...There was the Heifetz period, when I used a lot of fast vibrato and fast tempi; the Oistrakh period, when I tried wide vibrato and sensuous rich tone, and the Stern period -- when I didn't vibrate for a whole year."

- Itzhak Perlman