The first phase of avant-garde music emerged in:

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The first phase of avant-garde music emerged in the early 20th century in Paris and Vienna. In Paris, composers such as Claude Debussy and Maurice Ravel were exploring new ways of harmonizing and structuring music, while in Vienna, Arnold Schoenberg and his followers were developing atonal and twelve-tone music. Both cities were hubs of artistic experimentation and innovation at the time, and their influence on the development of avant-garde music cannot be overstated.

The First Phase of Avant-Garde Music Emerged In