Rules for Inverting Intervals

1. The RULE OF NINE: Inverted diatonic intervals add up to NINE.

2. Major inverts to minor; minor inverts to major.

3. Perfect inverts to perfect.

4. Augmented inverts to diminished; diminished inverts to augmented.

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Enharmonic Intervals

Intervals that equal the same number of semitones are called enharmonic.

They sound the same to the ear when played:

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Intervals in Major