Tertian harmonyTertian harmony refers to a harmonic structure based on stacking thirds. It is the most common type of harmony used in Western music after the Baroque period, as opposed to quartal harmony based on fourths or quintal harmony based on fifths.
In tertian harmony, chords are built by stacking intervals of thirds. A tertian chord usually consists of a root, third, and fifth:
- A major chord contains a major third and a perfect fifth above the root: C E G. - A minor chord contains a minor third and a perfect fifth: C Eb G
Other types of chords like seventh chords, ninth chords, etc. are also considered tertian as they continue stacking thirds:
- A major 7th chord: C E G B - A dominant 9th chord: C E G Bb D
So in summary, tertian harmony refers to the harmonic structure of Western music after the Baroque period, which is based primarily on stacking thirds to build chords. This gives Western music its distinctive sound and properties like tonality, functional harmony, and chord progressions.
Term applied to harmony which is based upon the interval of the third. Tertian harmony is particularly predominant in Western music from the Baroque era through the 19th century.
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