 "Tenor C" is an organ builder's term for "small C" or "C"3 (130.813 Hz), the note one octave below Middle C. In stoplists it usually means that a rank is not full compass, omitting the bottom octave.Traversing the circle of fifths can result in a B that is higher than C by 23.46 cents, the ratio of twelve just perfect fifths (B) to seven octaves being 531,441 / 524,288, the Pythagorean comma.A B that is three just major thirds above C is lower than the octave by an interval called a diesis, 125