Notes: C, Db, Eb, Fb, Gb, Ab, and Bbb - Key: C - Category: Octatonic Scales
The C Mixolydian #1 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 four black keys: Db, Eb, Gb, and Ab and three white keys: C, Fb, and Bbb. 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 Mixolydian #1 Scale we can find it has seven flats and no sharps. Therefore, on sheet music you will find seven accidentals on the score. The notes of this scale are: C, Db, Eb, Fb, Gb, Ab, and Bbb.