The sixteenth-minute Lu calendar note is called tirui, (kicking Rui). A sixteenth note is a note with a black face and two tails. It's half a note smaller than an eighth note. (equal to the duration of 1/16 of a whole note) One beat can be divided into four equal parts, each part is a sixteenth note, and is twice as fast as an eighth note. Sixteenths in a whole beat Two of the notes are on the down beat, and the other two are on the up beat. In Orff music, the sixteenth-point Lu calendar note is called tirui, (kicking Rui).