The Piano Sonata No. 7, Op. 64, subtitled White Mass, was written by Alexander Scriabin in 1911. As one of the late piano sonatas of Scriabin's career, the music is highly chromatic and almost atonal. George Perle says that, "the primary set upon which the Seventh Sonata is based," is, in linear order as spelled by Scriabin, E, F♯, G, A, B♭, C, D♭, and that the mystic chord may be derived from the quartal spelling of this set.
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