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In music theory a diatonic scale is a heptatonic (seven-note) 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 steps.
In 17 limit just intonation, the major diatonic semitone is 15:14 or 119.4 cents (Play ⓘ), and the minor diatonic semitone is 17:16 or 105.0 cents, [19] and septendecimal limma is 18:17 or 98.95 cents. Though the names diatonic and chromatic are often used for these intervals, their musical function is not the same as the meantone semitones.
Melodies can be based on a diatonic scale and maintain its tonal characteristics but contain many accidentals, up to all twelve tones of the chromatic scale, such as the opening of Henry Purcell's "Thy Hand, Belinda" from Dido and Aeneas (1689) with figured bass), which features eleven of twelve pitches while chromatically descending by half steps, [1] the missing pitch being sung later.
F ♯ (F-sharp; also known as fa dièse or fi) is the seventh semitone of the solfège. It lies a chromatic semitone above F and a diatonic semitone below G, thus being enharmonic to sol bémol or G ♭ (G-flat) in 12 equal temperament. However, in other temperaments, such as quarter-comma meantone, it is not the same as G ♭.
Notes that belong to the diatonic scale relevant in a tonal context are called diatonic notes. Notes that do not meet that criterion are called chromatic notes or accidentals. Accidental symbols visually communicate a modification of a note's pitch from its tonal context.
B Flat notes. B ♭ (B-flat), or, in some European countries, B, is the eleventh step of the Western chromatic scale (starting from C).It lies a diatonic semitone above A and a chromatic semitone below B, [1] thus being enharmonic to A ♯, even though in some musical tunings, B ♭ will have a different sounding pitch than A ♯.
A is a musical note equivalent to 440 Hz in typical A440 tuning. It is the sixth note of La and the tenth semitone of the fixed-do solfège.. Its enharmonic equivalents are B ♭ ♭ (B double flat) which is a diatonic semitone above A ♭ and G (G double sharp) which is a diatonic semitone below A ♯.
C ♯ (C-sharp) is a musical note lying a chromatic semitone above C and a diatonic semitone below D; it is the second semitone of the solfège. C-sharp is thus enharmonic to D ♭. It is the second semitone in the French solfège and is known there as do dièse. In some European notations, it is known as Cis.