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