I guess it's-- Joy to the world, the Lord has come, don't we sing it as a Christmas carol, or some can sing it as a Christmas carol?

我想是这样弹,普世欢腾,救主临降,我们不是将它做圣诞颂歌来唱的吗,或者有些人将它当做圣诞赞歌来唱

耶鲁公开课 - 聆听音乐课程节选

Those are two Christmas carols that are very conjunct in nature.

这两段是圣诞颂歌,本质都是级进

耶鲁公开课 - 聆听音乐课程节选