Which set of accidentals would you expect in a Melodic Minor scale?

In a Melodic Minor scale, the structure is unique because it differs when ascending compared to when descending. When ascending, the Melodic Minor scale raises both the 6th and the 7th degrees of the scale to create a smoother melodic line, which typically works to facilitate leading tones and resolve back to the tonic.

For the Melodic Minor scale, if you take the natural minor scale, you will raise the 6th and 7th degrees when going up. However, when descending, the scale reverts to the natural minor form, meaning the 6th and 7th degrees are lowered back to their original state. This contrasts with the Major scale, which maintains the same notes regardless of direction.

So, in essence, the correct answer reflects the structure of the Melodic Minor scale, indicating that accidentals are applied on the 6th and 7th degrees while ascending, but these notes are natural again when descending. This characteristic of the Melodic Minor scale is a fundamental aspect of its use in music, distinguishing it from the other types of minor scales.