Minimalism Electronic music It opened up a whole new world of possibilities to composers. Karlheinz stockhausen. Atonal music Serialism It uses every single note in a octive,(chromatic scale). Put any notes in any order in the chromatic scale, using them only once. The line of notes in a particular order is called the serial. Schoenberg Is the invented of serialism. You play the row of notes, then you play it backwards. After you've used inverted you use it retrograde order. Retrograde is where the first to notes you've chosen instead of going up notes you go down. Aleatoric music