"And when he left me and they told me he was going to you, Bill,I sat on my floor and cried.

VOA: standard.2010.05.18

One of them is the technique you saw me do with my left hand where I wiggled it a little bit. It's called vibrato.

其中有个技巧,你们看我左手的手法,我略微揉动琴弦引发出颤音

耶鲁公开课 - 聆听音乐课程节选