His mature
 pieces, such as his Opus 26 Wind Quintet and A Survivor from Warsaw, lack a key center and often feature
 the technique of Sprechtsimme.
In a choral work by this composer, a series of commands shouted by a sergeant are met by a men's
 chorus defiantly singing "Shema Yisroel." His first string quartet is only one movement, takes over forty
 minutes to perform, and consists of asymmetrical phrases this composer called "musical prose." This
 composer founded the Society for Private Musical Performances in order to play modernist music, and
 developed his characteristic style after his wife Mathilde left him for the painter Richard Gerstl. His mature
 pieces, such as his Opus 26 Wind Quintet and A Survivor from Warsaw, lack a key center and often feature
 the technique of Sprechtsimme. For 10 points, name this leader of the Second Viennese School who
 developed serialism and the twelve-tone row.
In a choral work by this composer, a series of commands shouted by a sergeant are met by a men's
 chorus defiantly singing "Shema Yisroel."
Arnold {Schoenberg}