Most of our popular music, folk songs and things like that, are written in duple meter and in a major key.

大多数的流行音乐,民歌,以及类似的音乐,是写在二拍子和大调上面

耶鲁公开课 - 聆听音乐课程节选

Occasionally, you do run into pop pieces, folk songs, in minor, but most of them are in major-- probably about eighty percent in major.

大家偶然也会碰到小调的流行音乐和民歌,但大多数还是大调,大概百分之八十是大调

耶鲁公开课 - 聆听音乐课程节选