State Museum of the History of St. Petersburg exhibitions began in 1957, celebrating the 250th anniversary of Leningrad. The museum contained over 1 million objects in 2002, including the collection of architects documents, photos and plans of Saint Petersburg of the 18th–20th centuries. State Museum of the History of St. Petersburg The State Museum of the History of St. Petersburg (), formerly the Museum of Leningrad History from 1955 to 1991, is a museum of the city history in Saint Petersburg, Russia. The headquarters of the museum are located in the Peter and Paul Fortress. It was established in 1938 as the Museum of History and Development of
20th-century music gestures and formlessness of late Romanticism which revived the balanced forms and clearly perceptible thematic processes of earlier styles. There were three distinct "schools" of neoclassicism, associated with Igor Stravinsky, Paul Hindemith, and Arnold Schoenberg. Similar sympathies in the second half of the century are generally subsumed under the heading "postmodernism". A compositional tradition arose in the mid-20th century—particularly in North America—called "experimental music". Its most famous and influential exponent was John Cage (1912–1992). According to Cage, "an experimental action is one the outcome of which is not foreseen", and he was specifically interested in completed works that performed an