What is known as 20th century classical music (or “modern music”) is music from about 1910 onwards. At this time many composers felt that everything had already been done by the composers of the past, so they wanted to find new ways of composing. Claude Debussy, Arnold Schoenberg and Igor Stravinsky, in particular, found new ways of writing music which was not necessarily tonal (in any particular key). Classical music was influenced by jazz, especially with American composers. Later in the century people such as Pierre Boulez and Karlheinz Stockhausen experimented in many other ways, including with electronic music (tape recorders etc.). Today’s composers have combined some of these ideas to develop their own styles.