Further Developments
Microtones and especially Quarter tones have been used in music of the 20th and 21st centuries. These are the notes smaller than a semitone. A full theory governing these has yet to be developed but the articles relating to these contain some of the most recent thoughts. (See 15 equal temperament, 19 equal temperament, 24 equal temperament, 34 equal temperament and 72 equal temperament.)
Read more about this topic: Post-tonal Music Theory
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