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.
... 1904 in music
1904 in sports
Events:
January 7 - The distress signal[?] "CQD" is established only to be replaced two years later by "SOS."
February 7 - ...