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The quartet 's repertoire was based around the works of Haydn , Mozart and Beethoven , but many contemporary composers also benefited from the quartet 's support , including Arnold Schoenberg .
 Haydn, Mozart, Beethoven, Arnold Schoenberg
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
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Text: {0} 
Answer:
 Haydn, Mozart, Beethoven, Arnold Schoenberg