Diatonic scale are major scales (those with a major third/triad: Ionian, Lydian, and Mixolydian), three are minor (those with a minor third/triad: Dorian, Phrygian, and Aeolian). To these may be added the seventh diatonic scale, with a diminished fifth above the reference note, the Locrian scale. These could be transposed not only to include one flat in the signature (as described by Glarean), but to all twelve notes of the chromatic scale, resulting in a total of eighty-four diatonic scales. The modern musical keyboard originated as a diatonic keyboard with only white keys. The black keys were progressively added for several purposes:
Bebop scale Harris. Ben-Hur further elaborates on the concept of placing additional chromatic passing tones between other notes in the scales. The bebop harmonic minor scale (or bebop natural minor scale, as listed in Mark Levine's "The Drop 2 Book") is derived from the harmonic minor scale and has a chromatic passing tone (an additional 7) between the 6th and the 7th notes. \override Score.TimeSignature #'stencil = ##f \relative c' { </score> It contains all of the notes of both the harmonic minor scale and the natural minor scale (Aeolian mode) of the same root. It can be used on all three