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Why does the melodic minor scale change when descending?

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scale The universality and innate nature of music, and the pentatonic scale, as demonstrated by singer Bobby McFerrin.

The melodic minor scale is unique among minor scales because it utilizes different interval patterns depending on whether the melody is ascending or descending.1

When ascending, the melodic minor scale raises the sixth and seventh tones by a half step compared to the natural minor scale. This adjustment creates a smoother, more "major-like" leading tone that resolves upward to the tonic, which is often preferred in melodic writing.1

Conversely, the descending melodic minor scale is identical to the natural minor scale. This change occurs because the raised sixth and seventh tones are not required to create a leading-tone resolution when moving downward toward the tonic. By reverting to the natural minor pattern during descent, the scale maintains the characteristic minor quality of the key without the need for the specific melodic alterations used to facilitate upward movement.21