Click on button to hear intervals played
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M2, Major Second, 2 half steps, a narrow, dissonant interval.
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M3, Major third, 4 half steps, a narrow, consonant interval.
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P5, Perfect 5, 7 half steps, has an open hollow, old world like sound.
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P8, Perfect 8 or octave, 12 half steps, a wide, consonant interval.