Both melody and bass could have had a triplet but he chose to have the duple in the bass--the triple up above.

旋律和低音部都可以运用三连音,但是他选择低音两拍,高音三拍

耶鲁公开课 - 聆听音乐课程节选

This is to get the feel of the duple and the triple. So see what you can do.

这两个动作,能让你亲身感受两拍和三拍,试试看吧

耶鲁公开课 - 聆听音乐课程节选

Yeah,it's regular, and with-- each chord was holding for two beats there in duple meter.

对，这是规则变化，每个和弦都维持两拍，这里一小节两拍。

耶鲁公开课 - 聆听音乐课程节选

And the 2 says that there'll be two in each of your units.

而这个二说明每单元两拍

耶鲁公开课 - 聆听音乐课程节选

So in our course we are only going to have two types of meter, These organizations taking the beat and organizing it into groups, is called superimposing meter on the music.

所以我们的课程中,只会出现两种拍子,这些组织方式将拍编组,在音乐中称为拍子的叠加

耶鲁公开课 - 聆听音乐课程节选

As you may know, there's yet another organization where we could group this in units of four but for all intents and purposes-- there are a few nuances to it-- four is simply a multiplication of two.

也许你知道的,还有另外一种组织方式,我们可以四拍一组,但是不论出于什么动机或者目的,这其中的区别甚微,四拍就是两拍的简单相乘

耶鲁公开课 - 聆听音乐课程节选

Rock really comes forth not so much in twos but in fours we'll call this a 4/4, and you caso we'll call this a 4/4 and you can beat a four pattern to it or you can beat a two pattern.

摇滚乐都是四拍子,不是二拍子,是四拍子,我们称为四四拍,你可以作为四拍子,也可以作为两拍子来打节拍

耶鲁公开课 - 聆听音乐课程节选