Serialism
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Ralph Vaughan Williams
Atonality
yes
Integral serialism (or total serialism).
Serialism
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John Cage's music is called serialism.
In serialism, composers use a technique called serialism, where they organize musical elements like pitches, rhythms, and dynamics into a predetermined series or order.
Ralph Vaughan Williams
Claude Debussy is accredited with creating music which was devoid of a particular harmonic tonal center, however Schoenberg may perhaps be considered the first "atonal" composer. He wrote music in an attempt to give "equal value" to all 12 tones. He wrotePierrot Lunaire which is considered one of the first pieces completely atonal.
Atonality
true
Serialism
yes
Arnold Schoenberg A+