with a piece of popular music you get a single ethos, a single feeling,a single mood associated with the piece, and the piece will tend to be shorter.

在流行乐里，一首歌只表达一个中心思想，一种感觉，一种情绪，所以这首作品也就会短小一些。

耶鲁公开课 - 聆听音乐课程节选

So that's the last music of Wolfgang Amadeus Mozart and his pupil, Suessmayr, and--not to leave you in a somber mood-- let's listen to Louis Armstrong as we go out. Okay?

那么,这就是莫札特和他的学生,苏斯迈尔一起完成的他最后的音乐,好了,别沉浸于忧郁的心情里,让我们聆听下路易斯·阿姆斯特朗的音乐,来领着我们下课吧,好吗

耶鲁公开课 - 聆听音乐课程节选