Notes: C, Eb, E, G, Ab, and B - Key: C - Origin: Latin - Category: Heptatonic Scales
The C Genus tertium 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: Eb, and Ab and four white keys: C, E, G, and B. This combination makes this scale - as well as the C Genus diatonicum, C Genus diatonicum veterum correctum, and C Genus primum - as great choices for composing or improvising Latin music.
If we take a look a the key signature of the C Genus tertium 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, Eb, E, G, Ab, and B.