Descending tetrachord

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.

Descending tetrachord in a minor: -♭-♭- (a-g-f-e) Play .
The Phrygian progression creates a descending tetrachord[1] bassline: -♭-♭- .
Phrygian half cadence: i-v6-iv6-V in c minor (bassline: c -b♭-a♭-g) Play .

See also

Sources
  1. "Phrygian Progression", Classical Music Blog.
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