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4.2.8Intervals In a Major Scale: How to Identify Them
So far, the discussion of intervals has focussed on intervals in which the first of the two notes is the lowest note of the scale, the tonic.
Can an interval start on any note? How do you identify them?
Sure. For example, you can start on the note A, the sixth note of the C major scale. If you then go up three semitones to C, that’s an interval of a minor third. Any span of three consecutive semitones is a minor third interval, no matter where it occurs in a scale.
Consider, for example, the intervals within this scale (Figure 16):

FIGURE 16: C Major Scale