The first phase of avant-garde music lasted from:

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The first phase of avant-garde music is generally considered to have begun around 1890 and lasted until the outbreak of World War I in 1914. This period saw the emergence of composers such as Arnold Schoenberg, Alban Berg, and Anton Webern, who were developing new ways of using harmony, melody, and form in their compositions. They were also exploring the use of atonality and other techniques that would later become associated with the Second Viennese School.

The First Phase of Avant-Garde Music Lasted From