If we have to sing a different pitch, then probably the harmony has changed.

如果觉得自己需要变调，那么和声就很可能已经改变了。

耶鲁公开课 - 聆听音乐课程节选

Then Chopin is sitting here and he modulates; he changes key. What about this?

然后肖邦这里徘徊了一下然后转调,他变调了,这个呢

耶鲁公开课 - 聆听音乐课程节选

Now the modulation--change of key from major to back to minor as the cortege will start up again and then we-- A nice clarinet sound there and here comes our cortege with the bass.

现在变调了,从大调,变回小调,送葬行列再次启动,然后我们听到了优美的单簧管,送葬行列伴随着低音来了

耶鲁公开课 - 聆听音乐课程节选