The term "classical music" was not used until the early 19th century. People then started talking about classical music in order to praise the great composers such as Bach, Mozart and Beethoven. In the 20th century many different ways of composing were used, including music played by electronic instruments or very modern music using strange sounds (experimental or "avant garde" music), for example the music of John Cage. Some people feel that this kind of music cannot really be described as "classical music".