D♭ (D-flat) is a musical note lying a diatonic semitone above C and a chromatic semitone below D. It is thus enharmonic to C♯. In the French solfège it is known as Re Bémol.
When calculated in equal temperament with a reference of A above middle C as 440 Hz, the frequency of middle D♭ (or D♭4) is approximately 277.183 Hz. See pitch (music) for a discussion of historical variations in frequency.
Designation by octave [edit]
| Scientific designation | Helmholtz designation | Octave name | Standard frequency (Hz) |
|---|---|---|---|
| D♭−1 | D♭͵͵͵ or ͵͵͵D♭ | Subsubcontra | 8.662 |
| D♭0 | D♭͵͵ or ͵͵D♭ | Subcontra | 17.324 |
| D♭1 | D♭͵ or ͵D♭ | Contra | 34.648 |
| D♭2 | D♭ | Great | 69.296 |
| D♭3 | d♭ | Small | 138.59 |
| D♭4 | d♭′ | One-lined | 277.18 |
| D♭5 | d♭′′ | Two-lined | 554.37 |
| D♭6 | d♭′′′ | Three-lined | 1108.7 |
| D♭7 | d♭′′′′ | Four-lined | 2217.5 |
| D♭8 | d♭′′′′′ | Five-lined | 4434.9 |
| D♭9 | d♭′′′′′′ | Six-lined | 8869.8 |
See also [edit]
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