Notes: C, Bb, Ab, G, F, Eb, and D - Key: C - Category: Octatonic Scales
The C Melodic Minor descending uses eight notes per octave. Because of this same reason it is a member of the so called Octatonic -scales that have Eight-note (or Eight-tone). On the piano keyboard, it is made up of three black keys: Ab, Eb, and D and four white keys: C, Bb, G, and F. This combination makes this scale - as well as the C Prometheus, C Prometheus Liszt, and C Prometheus Neapolitan - as great choices for composing or improvising music.
If we take a look a the key signature of the C Melodic Minor descending Scale we can find it has three flats and no sharps. Therefore, on sheet music you will find three accidentals on the score. The notes of this scale are: C, Bb, Ab, G, F, Eb, and D.