What distinguishes the Melodic Minor Scale?

The Melodic Minor Scale is distinguished by its unique approach to the sixth and seventh scale degrees, particularly in its ascending form. When ascending, the scale features raised sixth and seventh degrees, creating a distinct sound that contrasts with both the Natural Minor and Harmonic Minor scales. For instance, in the key of A Melodic Minor, the notes are A, B, C, D, E, F# (raising the sixth), and G# (raising the seventh) as you ascend.

This alteration helps the scale to more effectively lead to the tonic note when progressing to a resolution in melodic contexts, facilitating smoother melodic lines and harmonic resolutions. In its descending form, the Melodic Minor often reverts to the Natural Minor scale, with the sixth and seventh degrees lowered, further enhancing the contrast between ascending and descending passages. The focus on modifying the sixth and seventh degrees ascendingly is what accurately defines the Melodic Minor Scale, setting it apart from other scales.