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.

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Descending tetrachord in a minor : scale degree 8 - ♭ scale degree 7 - ♭ scale degree 6 - scale degree 5 (a-g-f-e) Play ⓘ .
The Phrygian progression creates a descending tetrachord bassline : scale degree 8 - ♭ scale degree 7 - ♭ scale degree 6 - scale degree 5 .
Phrygian half cadence : i-v6-iv6-V in c minor (bassline: c -b ♭ -a ♭ -g) Play ⓘ .