B♭ (musical note)
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B♭ (B-flat; also called si bémol) is the first note of the B♭ major scale. It is also enharmonic to A-sharp.
Designation by octave
| 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 |
| B♭2 | B♭ | Great | 116.541 |
| B♭3 | b♭ | Small | 233.082 |
| B♭4 | b♭′ | One-lined | 466.164 |
| B♭5 | b♭′′ | Two-lined | 932.328 |
| B♭6 | b♭′′′ | Three-lined | 1864.655 |
| B♭7 | b♭′′′′ | Four-lined | 3729.31 |
| B♭8 | b♭′′′′′ | Five-lined | 7458.62 |
| B♭9 | b♭′′′′′′ | Six-lined | 14917.24 |
| B♭10 | b♭′′′′′′′ | Seven-lined | 29834.481 |
Common scales beginning on B♭
- 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♭
