- D (musical note)
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D is a musical note a whole tone above C, and is known as Re within the solfege system.
When calculated in equal temperament with a reference of A above middle C as 440 Hz, the frequency of middle D (D4) is approximately 293.665 Hz. See pitch for a discussion of historical variations in frequency.
Designation by octave
Scientific designation Helmholtz designation Octave name Frequency (Hz) D-1 D͵͵͵ or ͵͵͵D Subsubcontra 9.177 D0 D͵͵ or ͵͵D Subcontra 18.354 D1 D͵ or ͵D Contra 36.708 D2 D Great 73.416 D3 d Small 146.832 D4 d′ One-lined 293.665 D5 d′′ Two-lined 587.33 D6 d′′′ Three-lined 1174.659 D7 d′′′′ Four-lined 2349.318 D8 d′′′′′ Five-lined 4698.636 D9 d′′′′′′ Six-lined 9397.273 Notes of the chromatic scale This music theory article is a stub. You can help Wikipedia by expanding it.