B

B is pitch class 11 — eleven semitones above C, one semitone below the octave return. It is a natural letter-name (Si or Ti in solfège), the white key between A♯/B♭ and C.

As the last step before C repeats, it is the leading tone in a C-major frame: a half-step that leans toward the tonic by interval, not by prophecy. The pitch class itself is simply the eleventh of twelve.

In major-triad grammar B is the root of B major (B–D♯–F♯), the major third of G major (G–B–D), and the perfect fifth of E major (E–G♯–B). Alone it stays a pitch class. Three notes of a recognized major chord may open a vessel offering.

Also known as B natural · Si · Ti