Schoenberg came from a strict Jewish family who had moved to Austria from Hungary. They were quite poor and Schoenberg taught himself about music. When he was grown up he had to do a lot of teaching to try and earn enough money to live. In later life he went to live in the United States. It took a long time before he was recognized world-wide as a great composer. His two most famous pupils were Alban Berg (1885-1935) and Anton Webern (1883-1945). He taught them how to write twelve-tone music and they became famous composers.
When Arnold Schoenberg was a young man he was living in the late 19th century. If you look at the way composers wrote music at this time you will find that their compositions became more and more chromatic. This means that more and more sharps and flats were used during the piece, and the music went from one key to another (modulated) very quickly. Richard Wagner wrote very chromatic music, especially in his opera Tristan and Isolde.
In 1898 Schoenberg converted to Christianity in the Lutheran church. According to MacDonald, this was partly to connect with Western European cultural traditions, and partly as a means of self-defence "in a time of resurgent anti-Semitism".
In 1933, after long thought, he returned to Judaism, because he realised that "his racial and religious heritage was inescapable", and to take up an unmistakable position on the side opposing Nazism. He would self-identify as a member of the Jewish religion later in life.
Schoenberg’s early works are mostly Late Romantic. His piece Verklärte Nacht (which can be played by six string instruments or by a whole orchestra) has very beautiful harmonies which go quickly from one key to another. Gradually Schoenberg’s music changed. It became so chromatic that it was no longer in any key at all. Music like this (called “atonal”) is much harder to understand. His Five Orchestral Pieces were played by the conductor Sir Henry Wood at a Promenade Concert in 1912. The audience did not like it at first and took some time to get used to the sound.
In 1923 Schoenberg developed the twelve-tone system for which he is famous. This is music which is based on a particular row of notes. Twelve-tone music is atonal because there is no feeling of being in any key, because of the equal use of every pitch.
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Arnold Schoenberg, by Egon Schiele 1917
Arnold Schoenberg Facts for Kids. Kiddle Encyclopedia.