The Augmented fifth reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Augmented fifth

The musical interval of an Augmented fifth is. It is the inversion of the diminished fourth, and in twelve tone equal temperament is enharmonically equal to a minor sixth.

The Augmented fifth is the largest interval in the Augmented chord. It can be produced by starting on a high note and playing the fifth below or by starting on a low note and playing the fifth above.

In an equal tempered tuning, an Augmented fifth is equal to eight semitones, a ratio of 1:2^8/12 (approximately 1.587), or 800 centss.

In the common practice period augmented fifths were considered dissonant or unstable and disallowed.

See also:

• musical tuning

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