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Insen is a tuning scale adapted from shamisen music by Yatsuhashi Kengyō for tuning of the koto. It only differs from the hirajoshi scale by one note.
In D mode it consists of: D-E♭-G-A-C so it has the same notes as the Phrygian chord.
Other chords compatible with insen scale include M7♯11 when the scale is played half steps lower and Cm6 and Cm when the scale is played one full step above.
In India's Carnatic music, this scale corresponds to Revati.
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