Definition: Based on Schoenberg's 12-tone system which was continued by his student Anton von Webern. Mostly evident in the music of the 1950s and 60s but appreciation was limited to university professors and their students. Serialism used a strict musical formula that was difficult to play. Composers who used this technique were Milton Babbitt and Pierre Boulez, to name a few.
Examples:"Structures" by Pierre Boulez.