Iwato
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Iwato is a musical scale that is similar to the Locrian mode (spelled 1 b2 b3 4 b5 b6 b7 8), seventh mode of the major scale, different in that it has no 3rd or 6th notes, thus making it pentatonic. It spelling is therefore 1 b2 4 b5 b7 8. It is used in traditional Japanese music for the koto.