In the melodic versions, 
In the melodic versions, you raise the sixth and seventh tones by a semitone, and in the harmonic versions, you raise only the seventh tone by a semitone. The messiest ones generally are considered to be A Sharp and A Flat, since they do not use any natural notes. The half steps are between both the second and third tones and the fifth and sixth tones. The easiest one to play is A, since all of the notes are natural. Name these scales that are often contrasted with major scales.
In the melodic versions, you raise the sixth and seventh tones by a semitone, and in the harmonic versions, you raise only the seventh tone by a semitone.
{Minor} (Scales or Key Signatures) (accept Aeolian, prompt Scales or Key Signatures)