The Note B

B as a musical pitch: its frequency, spellings, and the harmony built on top of it.

B is the leading tone in the key of C major — one semitone below the tonic, it creates a strong pull toward resolution. B major is a bright, ringing key popular in rock and pop. Its reference octave pitch is 493.88 Hz (MIDI note 71). The major triad on B is B Major (B – D# – F#), and the minor triad is B Minor (B – D – F#).