Piano Sonata no. 9 in F, op. 68, "Black Mass"

The Piano Sonata No. 9, Op. 68, commonly known as the Black Mass Sonata, is one of the late piano sonatas composed by Alexander Scriabin. The work was written around 1912–1913. Although its nickname was not invented by Scriabin (unlike the nickname White Mass given to his Piano Sonata No. 7), he approved of it.