music theory Music theory is the study of the practices and possibilities of music. ''The Oxford Companion to Music'' describes three interrelated uses of the term "music theory". The first is the "rudiments", that are needed to understand music notation (ke ...

, the descending tetrachord is a series of four notes from a scale, or

tetrachord In music theory, a tetrachord ( el, τετράχορδoν; lat, tetrachordum) is a series of four notes separated by three intervals. In traditional music theory, a tetrachord always spanned the interval of a perfect fourth, a 4:3 frequency propo ...

, arranged in order from highest to lowest, or descending order. For example, --- , as created by the

Andalusian cadence The Andalusian cadence (diatonic phrygian tetrachord) is a term adopted from flamenco music for a chord progression comprising four chords descending stepwise – a iv–III–II–I progression with respect to the Phrygian mode or i–VII–VI� ...

. The descending tetrachord may fill a

perfect fourth A fourth is a musical interval encompassing four staff positions in the music notation of Western culture, and a perfect fourth () is the fourth spanning five semitones (half steps, or half tones). For example, the ascending interval from C to ...

or a

chromatic fourth In music theory, a chromatic fourth, or ''passus duriusculus'',Monelle, Raymond (2000). ''The Sense of Music: Semiotic Essays'', p.73. . is a melody or melodic fragment spanning a perfect fourth with all or almost all chromatic intervals fill ...

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External links

"Tetrachord"
''Britannica.com''. {{music-theory-stub Music theory

See also

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