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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.
-♭-♭- (a-g-f-e) .
-♭-♭- .Phrygian half cadence: i-v6-iv6-V in c minor (bassline: c -b♭-a♭-g) .
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