Hirajoshi
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Hirajoshi, or hira-choshi (Japanese 平調子: chōshi = tuning and hira = even, level, tranquil, standard or regular) is a tuning scale adapted from shamisen music by Yatsuhashi Kengyō for tuning of the koto.[1]
It is essentially a standard pentatonic scale in Aeolian mode (i.e. the sixth degree of a scale).
In D mode it consists of: D-Eb-G-A-Bb.[2] Other scales includes the Insen, Iwato and Kumojoshi scales.