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To invert an interval consists to put an octave higher the interval lowest note. This gives a new interval, complementary to the first one.
To invert an interval consists to put an octave higher the interval lowest note. An interval and its inversion are complementary and always form an octave.
Name of an inverted interval
To find the name of the inverted interval, simply perform the following operation: 9 - interval = inverted interval.
For example, the inversion of a third is a sixth (9 - 3 = 6).
The following table summarizes the equivalences between interval and inversion.
Qualification of a inverted interval
The qualification of an inverted interval is always the opposite of the qualification of the original interval.
The interval D-C becomes C-D when inversed. The latter is a major second. The interval D-C is therefore a minor seventh (9 - 2 = 7, minor opposite to major).
The interval F-D becomes D-F when inversed. The latter is a major third. The interval F-D is therefore a minor sixth (9 - 3 = 6, minor opposite to major).
The interval C-G becomes G-C when inversed. The latter is a diminished fourth. The interval C-G is therefore an augmented fifth (9 - 4 = 5, augmented opposite to diminished).
Last update on 2018/12/03
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