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D[1] is amusical note awhole tone aboveC, and is known asRe within thefixed-Do solfege system. Itsenharmonic equivalents are C
(C-double sharp) and E
(E-double flat). It is the third semitone of thesolfège.
When calculated inequal temperament with a reference of A above middle C as 440 Hz, the frequency ofmiddle D (D4) is approximately 293.665Hz.[2] Seepitch for a discussion of historical variations in frequency.
| Scientific designation | Helmholtz designation | Octave name | Frequency (Hz) | MIDI note number |
|---|---|---|---|---|
| D−1 | D͵͵͵ or ͵͵͵D or DDDD | Subsubcontra | 9.177 | 2 |
| D0 | D͵͵ or ͵͵D or DDD | Subcontra | 18.354 | 14 |
| D1 | D͵ or ͵D or DD | Contra | 36.708 | 26 |
| D2 | D | Great | 73.416 | 38 |
| D3 | d | Small | 146.832 | 50 |
| D4 | d′ | One-lined | 293.665 | 62 |
| D5 | d′′ | Two-lined | 587.33 | 74 |
| D6 | d′′′ | Three-lined | 1174.659 | 86 |
| D7 | d′′′′ | Four-lined | 2349.318 | 98 |
| D8 | d′′′′′ | Five-lined | 4698.636 | 110 |
| D9 | d′′′′′′ | Six-lined | 9397.273 | 122 |
| D10 | d′′′′′′′ | Seven-lined | 18794.545 | N/A |
