這裡開始講解樂理的核心重點概念：音階與調性。

Scale.

(音階)

原文：

The diatonic scale consists of 5 whole and two half tones.

The half tones of the major scale are between the 3. and 4. and the 7. and 8. interval.

The 6. and 7. interval of the minor scale is raised while ascending; the half tones are between the second and third and the seven and eighth interval.

The major-and minor-triad consists of the 1. 3. and 5. tone of the scale; for instance.