Basic Music TheoryIntroduction
The Major Scale
Secondary intervals (2nd, 3rd, 6th, 7th) are major when the upper note falls within the major scale of the root. If the upper note is lowered a half step, the interval is minor.
The above example shows a major third and a minor third, with C as the root. The third note in the C Major scale is E. Therefore, C to E is a major 3rd, and C to E-flat is a minor third.
Likewise, the above example shows a major and minor 6th, with C as the root. The 6th note in the C Major scale is A. Therefore, C to A is a major 6th, and C to A-flat is a minor 6th.
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