B♭ (musical note)
B♭ (B-flat; also called si bémol) is the eleventh step of the Western chromatic scale (starting from C). It lies a diatonic semitone above A and a chromatic semitone below B, thus being enharmonic to A♯, even though in some musical tunings, B♭ will have a different sounding pitch than A♯. B-flat is also enharmonic to C.
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When calculated in equal temperament with a reference of A above middle C as 440 Hz, the frequency of the B♭ above middle C is approximately 466.164 Hz. See pitch (music) for a discussion of historical variations in frequency.
In Germany, Russia, Poland and Scandinavia, this pitch is designated B, with 'H' used to designate the B-natural. Since the 1990s, B-flat is often denoted Bb or "Bess" instead of B in Swedish music textbooks. Natural B is called B by Swedish jazz and pop musicians, but still denoted H in classical music. See B (musical note) and Musical note#Note names and their history for explanations.
Designation by octaveEdit
|Scientific designation||Helmholtz designation||Octave name||Frequency (Hz)|
|B♭−1||B♭͵͵͵ or ͵͵͵B♭ or BBBB♭||Subsubcontra||14.568|
|B♭0||B♭͵͵ or ͵͵B♭ or BBB♭||Subcontra||29.135|
|B♭1||B♭͵ or ͵B♭ or BB♭||Contra||58.27|
Common scales beginning on B♭Edit
- B-flat major: B♭ C D E♭ F G A B♭
- B-flat natural minor: B♭ C D♭ E♭ F G♭ A♭ B♭
- B-flat harmonic minor: B♭ C D♭ E♭ F G♭ A B♭
- B-flat melodic minor ascending: B♭ C D♭ E♭ F G A B♭
- B-flat melodic minor descending: B♭ A♭ G♭ F E♭ D♭ C B♭
- B♭ Ionian: B♭ C D E♭ F G A B♭
- B♭ Dorian: B♭ C D♭ E♭ F G A♭ B♭
- B♭ Phrygian: B♭ C♭ D♭ E♭ F G♭ A♭ B♭
- B♭ Lydian: B♭ C D E F G A B♭
- B♭ Mixolydian: B♭ C D E♭ F G A♭ B♭
- B♭ Aeolian: B♭ C D♭ E♭ F G♭ A♭ B♭
- B♭ Locrian: B♭ C♭ D♭ E♭ F♭ G♭ A♭ B♭