![]() ![]() Most likely, it refers to the intervals being "stretched out" in that tuning, in contrast to the other two genera (chromatic and enharmonic). The term diatonic originally referred to the diatonic genus, one of the three genera of the ancient Greeks, and comes from Ancient Greek: διατονικός, romanized: diatonikós, of uncertain etymology. In musical set theory, Allen Forte classifies diatonic scales as set form 7–35. A diatonic scale can be also described as two tetrachords separated by a whole tone. Modern musical keyboards are designed so that the white-key notes form a diatonic scale, though transpositions of this diatonic scale require one or more black keys. For instance, the seven natural pitch classes that form the C- major scale can be obtained from a stack of perfect fifths starting from F:Īny sequence of seven successive natural notes, such as C–D–E–F–G–A–B, and any transposition thereof, is a diatonic scale. The seven pitches of any diatonic scale can also be obtained by using a chain of six perfect fifths. ![]() This pattern ensures that, in a diatonic scale spanning more than one octave, all the half steps are maximally separated from each other (i.e. 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 steps, depending on their position in the scale. ![]()
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