+"Bb" refers to the musical [Note](/wiki/note) B-flat, a fundamental building block in [Western Music](/wiki/western_music). It is a [Semitone](/wiki/semitone) below B natural, frequently signifying a [Key](/wiki/key) or [Chord](/wiki/chord) within compositions.
+## See also
+- [Music Theory](/wiki/music_theory)
+- [Scale](/wiki/scale)
+- [Pitch](/wiki/pitch)
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