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Who was Mathilde von Zemlinsky?

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Austrian composer Arnold Schoenberg in a suit, seated at a piano and holding a conductor's baton, appears to be conducting music in a wood-paneled room. — Arnold Schoenberg Austrian-American composer Arnold Schoenberg was one of the most influential teachers of music composition of the 20th century. He also was known for his creation of new methods of musical composition involving atonality, namely serialism and the 12-tone row.

Mathilde von Zemlinsky was the sister of the Austrian composer and conductor Alexander Zemlinsky. In 1901, she married the composer Arnold Schoenberg, who was a close friend and professional associate of her brother.12