Notes: C, Db, F#, and G - Key: C - Category: Pentatonic Scales
The C Messiaen truncated mode 5 uses five notes per octave. Because of this same reason it is a member of the so called Pentatonic -scales that have Five-note (or Five-tone). On the piano keyboard, it is made up of two black keys: Db, and F# and two white keys: C, and G. 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 Messiaen truncated mode 5 Scale we can find it has one flats and one sharps. Therefore, on sheet music you will find two accidentals on the score. The notes of this scale are: C, Db, F#, and G.