**Inverted intervals are simply intervals which have been turned upside down.** To invert an interval just take the bottom note, and put it on the top!

Inverting perfect intervals

As you can see below by taking the C at the bottom of the interval and moving it above the G, the initial interval of a 5th turns into a 4th when turned upside down. **A perfect interval always stays perfect when inverted.**

Major and minor inverted intervals

As you can see in the example below, **when inverted, a major interval becomes a minor interval, and a minor interval becomes a major interval.**

Inverting augmented and diminished intervals

The example below show the inversion of an augmented interval.**When an augmented interval is inverted it becomes diminished and when a diminished interval is inverted it becomes augmented.**

But why does it add up to 9

Many students are initially confused by the fact both intervals add up
to 9. An octave has 8 notes, and there is an octave between the bottom
note of the first and the top note of the inversion of the interval…so why does
it add up to 9? The answer is that the note in the middle is counted
twice. Remember we count *both* notes when calculating an interval, so the G has effectively been counted twice.

Why is this useful?

Learning how to invert intervals is very useful if you are confronted
with working out an interval for which you do not know the scale. E.g.
in the question below you would need to know the notes of the scale of **D♯ major** to work out the interval.

**But**, using inversion you can work out the interval in the key of G major (after inversion) and find the interval is an **Augmented 5th**.

All you need to know now is that Augmented becomes Diminished, and that a
5th must become a 4th because the intervals need to add up to 9! **So therefore the answer is Augmented 4th**, without even having to think about the D♯ major scale! And not having to work out the D♯ major scale is

Recap

When inverting an interval:**Major becomes Minor and Minor becomes MajorPerfect stays PerfectAugmented becomes Diminished and Diminished becomes Augmented**And remember the original and inverted interval should always add up to 9.

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