D (D-flat) is a musical note lying a

diatonic semitone A semitone, also called a half step or a half tone, is the smallest musical interval commonly used in Western tonal music, and it is considered the most dissonant when sounded harmonically. It is defined as the interval between two adjacent no ...

above C and a

chromatic semitone In modern Western tonal music theory an augmented unison or augmented prime is the interval between two notes on the same staff position, or denoted by the same note letter, whose alterations cause them, in ordinary equal temperament, to be o ...

below D. It is thus

enharmonic In modern musical notation and tuning, an enharmonic equivalent is a note, interval, or key signature that is equivalent to some other note, interval, or key signature but "spelled", or named differently. The enharmonic spelling of a written ...

to C. In the French

solfège In music, solfège (, ) or solfeggio (; ), also called sol-fa, solfa, solfeo, among many names, is a music education method used to teach aural skills, pitch and sight-reading of Western music. Solfège is a form of solmization, though the two ...

it is known as re bémol. When calculated in

equal temperament An equal temperament is a musical temperament or tuning system, which approximates just intervals by dividing an octave (or other interval) into equal steps. This means the ratio of the frequencies of any adjacent pair of notes is the same, ...

with a reference of A above middle C as 440 Hz, the

frequency Frequency is the number of occurrences of a repeating event per unit of time. It is also occasionally referred to as ''temporal frequency'' for clarity, and is distinct from '' angular frequency''. Frequency is measured in hertz (Hz) which is ...

of middle D (or D₄) is approximately 277.183 Hz. See

pitch (music) Pitch is a perceptual property of sounds that allows their ordering on a frequency-related scale, or more commonly, pitch is the quality that makes it possible to judge sounds as "higher" and "lower" in the sense associated with musical melodi ...

for a discussion of historical variations in frequency.

Designation by octave

Scales

Common scales beginning on D

D major D major (or the key of D) is a major scale based on D, consisting of the pitches D, E, F, G, A, B, and C. Its key signature has two sharps. Its relative minor is B minor and its parallel minor is D minor. The D major scale is: : ...

: D E F G A B C D * D natural minor: D E F G A B C D * D harmonic minor: D E F G A B C D * D melodic minor ascending: D E F G A B C D * D melodic minor descending: D C B A G F E D

Diatonic scale In music theory, a diatonic scale is any heptatonic scale that includes five whole steps (whole tones) and two half steps (semitones) in each octave, in which the two half steps are separated from each other by either two or three whole st ...
s

* D

Ionian Ionic or Ionian may refer to: Arts and entertainment * Ionic meter, a poetic metre in ancient Greek and Latin poetry * Ionian mode, a musical mode or a diatonic scale Places and peoples * Ionian, of or from Ionia, an ancient region in western ...

: D E F G A B C D * D

Dorian Dorian may refer to: Ancient Greece * Dorians, one of the main ethnic divisions of ancient Greeks * Doric Greek, or Dorian, the dialect spoken by the Dorians Art and entertainment Films * ''Dorian'' (film), the Canadian title of the 2004 film ' ...

: D E F G A B C D * D Phrygian: D E F G A B C D * D Lydian: D E F G A B C D * D

Mixolydian Mixolydian mode may refer to one of three things: the name applied to one of the ancient Greek ''harmoniai'' or ''tonoi'', based on a particular octave species or scale; one of the medieval church modes; or a modern musical mode or diatonic sca ...

: D E F G A B C D * D

Aeolian Aeolian commonly refers to things related to either of two Greek mythological figures: * Aeolus (son of Hippotes), ruler of the winds * Aeolus (son of Hellen), son of Hellen and eponym of the Aeolians * Aeolians, an ancient Greek tribe thought to ...

: D E F G A B C D * D Locrian: D E F G A B C D

Jazz melodic minor

* D ascending melodic minor: D E F G A B C D * D Dorian ♭2: D E F G A B C D * D Lydian augmented: D E F G A B C D * D

Lydian dominant In music, the acoustic scale, overtone scale, Lydian dominant scale, Lydian 7 scale, or the Pontikonisian Scale is a seven-note synthetic scale. : This differs from the major scale in having an augmented fourth and a minor seventh scale degr ...

: D E F G A B C D * D Mixolydian ♭6: D E F G A B C D * D Locrian ♮2: D E F G A B C D * D altered: D E F G A B C D

Designation by octave

Scales

Common scales beginning on D

Diatonic scale In music theory, a diatonic scale is any heptatonic scale that includes five whole steps (whole tones) and two half steps (semitones) in each octave, in which the two half steps are separated from each other by either two or three whole st ...s

Jazz melodic minor

See also

Diatonic scale In music theory, a diatonic scale is any heptatonic scale that includes five whole steps (whole tones) and two half steps (semitones) in each octave, in which the two half steps are separated from each other by either two or three whole st ...
s