'''Piano Sonata No. 8''', Op. 66, by Alexander Scriabin, was composed between 1912 and 1913. As one of Scriabin's late piano sonatas, the eighth sonata is highly atonal, though arguably less dissonant than some of his other late works. Scriabin saw some parts of this sonata, which, like the sixth sonata, he never performed in public, as "the most tragic episode of my creative work".