Melodic Minor scales
The Melodic Minor scale is the same as the natural minor with the exception that the sixth and seventh tones are raised by a semitone (half step) when the scale is ascending. When the scale is descending, the melodic minor is the same as the natural minor.
Example in Key of C
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Example in Key of C
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http://www.music.vt.edu/musicdictionary/textm/Melodicminorscale.html