Lament bass

In music, the lament bass is a ground bass, built from a descending perfect fourth from tonic to dominant, with each step harmonized. The diatonic version is the upper tetrachord from the natural minor scale, known as the Phrygian tetrachord, while the chromatic version, the chromatic fourth, has all semitones filled in. It is often used in music to denote tragedy or sorrow.

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