📁 阿特奥恩阿尔伊特伊
Composers who compose atonal music, which is defined by the "Oxford Companion to Music" as music with the absence of a key. Schonberg was one of the first composers to do this.
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Aaron Copland: The Life And Work Of An Uncommon Man
http://www.classical.net/music/books/reviews/0805049096a.php