A harmonic interval occurs when two notes are played at the same time. ... For example, taking C as the tonic (the "1" or the first degree of the scale), then the third degree of the C major scale is E, so the interval between C and E is called a major third.
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A harmonic interval occurs when two notes are played at the same time. ... For example, taking C as the tonic (the "1" or the first degree of the scale), then the third degree of the C major scale is E, so the interval between C and E is called a major third.