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Augmented Triads: What Makes A Chord Augmented?



Augmented triads (and all triads) in root position consist of an interval of a third from the root note to the "third," or middle note, and another interval of a third from the middle note ("third") to the top note, called the "fifth."

The other interval at play in a triad is the distance from the "root" to the "fifth," which is an interval of a fifth.

Thirds

An interval of a third can be either qualified as major or minor.

A major third is four half steps, and a minor third is three half steps.

An interval of a "perfect" fifth is seven half steps, but an "augmented" fifth is eight half steps.

So What Makes A Triad "Augmented"?

An augmented chord in root position (the root being the lowest note) is made up of an interval of a major third from the "root" to the "third," and another interval of a major third from the "third" to the "fifth." This means the distance is from the root to the fifth is one half step more than a "perfect" fifth, and so it is "augmented."

In the chart below the intervals are represented:

Major third = M3
Minor third = m3
Augmented fifth = A5



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