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B♭ (musical note)

c musical note, b sharp 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♯ although in some musical tunings, B♭ will have a different sounding pitch than A♯ B-flat is also enharmonic to C

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 466164 Hz See pitch music for a discussion of historical variations in frequency

While orchestras tune to an A provided by the oboist, wind ensembles usually tune to a B-flat provided by a tuba, horn, or clarinet

In Germany, Russia, Poland and Scandinavia this pitch is designated B, with 'H' used to designate the B-natural or enharmonically C♭ 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 for an explanation


  • 1 Designation by octave
  • 2 Scales
    • 21 Common scales beginning on B♭
    • 22 Diatonic scales
    • 23 Jazz melodic minor
  • 3 See also

Designation by octaveedit

Scientific designationHelmholtz designationBilinear music notationOctave nameFrequency Hz
B♭−1B♭͵͵͵ or ͵͵͵B♭ or BBBB♭-uB♭Subsubcontra14568
B♭0B♭͵͵ or ͵͵B♭ or BBB♭-vB♭Subcontra29135
B♭1B♭͵ or ͵B♭ or BB♭-wB♭Contra58270


Common scales beginning on B♭edit

  • B♭ Major:B♭ C D E♭ F G A B♭
  • B♭ Natural Minor:B♭ C D♭ E♭ F G♭ A♭ B♭
  • B♭ Harmonic Minor:B♭ C D♭ E♭ F G♭ A B♭
  • B♭ Melodic Minor Ascending:B♭ C D♭ E♭ F G A B♭
  • B♭ Melodic Minor Descending:B♭ A♭ G♭ F E♭ D♭ C B♭

Diatonic scalesedit

  • 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♭

Jazz melodic minoredit

  • B♭ Ascending Melodic Minor:B♭ C D♭ E♭ F G A B♭
  • B♭ Dorian ♭2:B♭ C♭ D♭ E♭ F G A♭ B♭
  • B♭ Lydian Augmented:B♭ C D E F♯ G A B♭
  • B♭ Lydian Dominant:B♭ C D E F G A♭ B♭
  • B♭ Mixolydian ♭6:B♭ C D E♭ F G♭ A♭ B♭
  • B♭ Locrian ♮2:B♭ C D♭ E♭ F♭ G♭ A♭ B♭
  • B♭ Altered:B♭ C♭ D♭ E F♭ G♭ A♭ B♭

See alsoedit

  • Piano key frequencies
  • List of B-flat instruments
  • B-flat major
  • B-flat minor
  • Root chord

b flat musical note, b sharp musical note, b vs b flat musical note, c musical note, c musical note image

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B♭ (musical note)

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