B (musical note)
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The referent of the musical note B varies by location.
In the United States, Canada, the United Kingdom and the Republic of Ireland it usually refers to the note a semitone below C, while B flat refers to the note a whole tone below C.
In most of continental Europe, B is used to mean what above is called B flat and H is used to mean what above is called B. This makes possible certain spellings which are otherwise impossible, such as the BACH motif.
See Note for a discussion on other differences in letter naming of the notes.