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Adding Precision

Previously we looked at the numeric section of an interval, which provides a rough measurement of the distance between two pitches.  The numeric portion of an interval can be thought of as being similar to the numbers on a ruler or the hour hand on the clock.

The quality of an interval provides a more precise measurement than the numeric portion alone.  The quality can be thought of as the marks between numbers on a ruler or the minute hand of a clock.

Musical intervals have two sets of qualities:

The quality set that is applied to an interval depends upon the numeric portion of the interval, as follows:

Noteworthy– Since Diminished and Augmented appear in both quality sets, any interval may be diminished or augmented

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