Modern classical music is music written in the 20th century and beyond. Although much of it draws heavily on earlier forms, modern composers also experimented with rejection of long-held ideas; notably, Arnold Schoenberg questioned the traditional notions of harmony with his twelve-tone system[?], and John Cage questioned the very definition of music with his use of chance and found sounds.
... narrower part, and from Yezo (Japan) by the Strait of La Pérouse. Sakhalin is the largest island of the Russian Federation, being 948 km (589 miles) long, and 25 to 170 km ...