Which major trend in music since World War II was best expressed in the works of Olivier Messiaen?

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Olivier Messiaen was a key figure in the development of serialism, a major trend in music since World War II that sought to break free from the traditional tonal system by organizing sounds in a predetermined order. Messiaen's use of symmetrical and rhythmic patterns, as well as his use of birdsong and religious themes, were hallmarks of serialism.

Which Major Trend in Music Since World War II Was