In music theory, the descending tetrachord is a series of four notes from a scale, or tetrachord, arranged in order from highest to lowest, or descending order. For example, -♭-♭- , as created by the Andalusian cadence. The descending tetrachord may fill a perfect fourth or a chromatic fourth.
- "Phrygian Progression", Classical Music Blog.
- "Tetrachord", Britannica.com.
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