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.
... the Sakhalin fir[?] (Abies sachalensis) and the Daurian larch[?] are the chief trees; on the upper parts of the mountains are the Siberian rampant cedar[?] (Cembra ...