Notes: C, Db, D, E, F, Gb, G, A, and Bb - Key: C - Origin: Chinese - Category: Decatonic Scales
The C Youlan uses ten notes per octave. Because of this same reason it is a member of the so called Decatonic -scales that have Ten-note (or Ten-tone). On the piano keyboard, it is made up of three black keys: Db, Gb, and Bb and six white keys: C, D, E, F, G, and A. This combination makes this scale - as well as the C Qing Shang, C Qing Yu, and C Quan Ming - as great choices for composing or improvising Chinese music.
If we take a look a the key signature of the C Youlan Scale we can find it has three flats and no sharps. Therefore, on sheet music you will find three accidentals on the score. The notes of this scale are: C, Db, D, E, F, Gb, G, A, and Bb.