This helicopter crew knows that. Doctors say these patients need to get medical care within two hours for the best results.

VOA: standard.2010.04.18

So how do these musicians generate two hours of music with no music in front of them?

那这些音乐家是如何持续演出两个小时的呢,在没有乐谱的情况下

耶鲁公开课 - 聆听音乐课程节选