Dmitri Dmitriyevich Shostakovich; 25 September 1906 – 9 August 1975) was a Soviet Russian composer and pianist and a prominent figure of 20th century music. After a period influenced by Sergei Prokofiev and Igor Stravinsky, Shostakovich developed a hybrid style, as exemplified by Lady Macbeth of the Mtsensk District (1934). This single work juxtaposed a wide variety of trends, including the neo-classical style (showing the influence of Stravinsky) and post-Romanticism (after Gustav Mahler). Sharp contrasts and elements of the grotesque characterize much of his music. Shostakovich's orchestral works include 15 symphonies and six concerti. His chamber output includes 15 string quartets, a piano quintet, two piano trios, and two pieces for string octet. His piano works include two solo sonatas, an early set of preludes, and a later set of 24 preludes and fugues. Other works include three operas, several song cycles, ballets, and a substantial quantity of film music.