This is his Symphony No.5 in B-flat so let's listen to this.

我们要听的来自他的降B大调第五交响曲。

耶鲁公开课 - 聆听音乐课程节选

And then at the end of the process I have another whole step from B-flat back to C, and that gets me back to my octave in that fashion.

最后一步,从降B回到C是一个全音级,然后完成了整个八度

耶鲁公开课 - 聆听音乐课程节选