piece also contains an incipient instance of the mystic chord which helps illuminate its origins in tonal language; first appearing at m. 122, the set [0 2 4 6 T] is presented as a dominant chord with the flat fifth degree in the bass, later revealed to be an extended appogiatura to the tonic (m. 134), over which the same notes form a major 13th chord in root position. Compare this presentation with the 'mature' mystic chord, [0 1 3 5 7 9]. Recordings This is Scriabin's most recorded sonata. Pianist Sviatoslav Richter described it as the most difficult piece in the entire piano repertory. Notable recordings include those by Alexei Sultanov, Vladimir Ashkenazy, Vladimir Horowitz, Sviatoslav Richter, Vladimir Sofronitsky, Michael Ponti, Samuil Feinberg, Glenn Gould, Garrick Ohlsson, Marc-André Hamelin, Bernd Glemser, Maria Lettberg, Igor Zhukov and Pietro Scarpini. Notes References External links Piano Sonata 05 1907 compositions