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.
... US$10 million.
The best-known collectors of Bugatti were Hans and Fritz Schlumpf, two brothers who ran a textiles business in Mulhouse[?], close to the Bugatti factory. ...