Let's listen to Luciano Pavarotti sing a leading tone, and as by coincidence, it happens to be the one-year anniversary of Pavarotti's death this week.

让我们听一下,卢西亚诺·帕瓦罗蒂演唱的导音,巧合的是,这周恰好是,帕瓦罗蒂逝世一周年

耶鲁公开课 - 聆听音乐课程节选

If you took the two derivatives of this guy, In other words, Same thing there.

对这一项求两次导,也就是说,这里也是一样

耶鲁公开课 - 基础物理课程节选

Okay.This is the intro.

好，这一段是导奏。

耶鲁公开课 - 聆听音乐课程节选