Hirajōshi scale
Hirajōshi scale, or hira-choshi is a tuning scale adapted from shamisen music by Yatsuhashi Kengyō for tuning of the koto. "The hirajoshi, kumoijoshi, and kokinjoshi 'scales' are Western derivations of the koto tunings of the same names. These scales have been used by rock and jazz guitarists in search of 'new' sounds."
Burrows gives C-E-F-G-B. Sachs, as well as Slonimsky, give C-D-F-G-B. Speed and Kostka & Payne give C-D-E-G-A. Note that all are hemitonic pentatonic scales and are different modes of the same pattern of intervals, 2-1-4-1-4 semitones.
The five modes of hirajoshi can also be derived as subsets of the Ionian, Phrygian, Lydian, Aeolian, and Locrian modes.
Synonymous scales have different names per region of Japan, as well as according to several ethnomusicologists and researchers, which may lead to some confusion. For example, the Iwato scale bears the same intervals as Slonimsky's concept of the Hirajoshi scale, and is also the fourth mode of the In scale. The same scale given by Kostka & Payne matches the third mode of the In scale.
