The composer best known for using tone clusters, the technique of smashing down a large group of adjacent notes on a piano to create a dense and dissonant sound, is Schoenberg.
Arnold Schoenberg was a music composer, writer, and painter.
He was an Austrian-American composer who pioneered atonality-based composition techniques such as serialism and the 12-tone row.
He was also a powerful teacher, with Alban Berg and Anton Webern among his most notable students.
Thus, the composer best known for using tone clusters is Schoenberg.
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