Notes: C, C#, E, F#, G, A, and A# - Key: C - Origin: Russian - Category: Octatonic Scales
The C Petrushka chord 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: C#, F#, and A# and four white keys: C, E, G, and A. This combination makes this scale - as well as the C Shostakovich, C Tcherepnin Nine-Note Mode I, and C Tcherepnin Major Pentatonic Mode I - as great choices for composing or improvising Russian music.
If we take a look a the key signature of the C Petrushka chord Scale we can find it has no flats and three sharps. Therefore, on sheet music you will find three accidentals on the score. The notes of this scale are: C, C#, E, F#, G, A, and A#.