20th century

20th-century classical music describes orchestral works, chamber music, solo instrumental works (including keyboard music), electronic music, choral music, songs, operas, ballets, concertos, symphonies, and related forms, as well as fantasies, rhapsodies, fugues, passacaglias and chaconnes, variations, oratorios, cantatas, suites, improvisational and newly developed formal concepts such as variable and mobile forms, that have been written and performed since 1900.

This era was without a dominant style and composers have created highly diverse kinds of music. Modernism, impressionism, post-romanticism, neoclassicism, expressionism, and, later, minimalism were all important movements. Atonality, serialism, musique concrète and  electronic music  were all developed during this period. Jazz was an important influence on many composers in this period.