Notes: C, D, Eb, F, G, A, and B - Key: C - Category: Octatonic Scales
The C Minor-Major 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 one black keys: Eb and six white keys: C, D, F, G, A, and B. 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 Minor-Major Scale we can find it has one flats and no sharps. Therefore, on sheet music you will find one accidentals on the score. The notes of this scale are: C, D, Eb, F, G, A, and B.