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GJOFJ3 · 61-69, M
B# is a white key on the piano. Another name for B# is C, which has the same note pitch / sound, which means that the two note names are enharmonic to each other. It is called sharp because it is 1 half-tone(s) / semitone(s) up from the white note after which is is named - note B. The next note up from B# is C# / Db.