Music Style Founded by Viennese Composer Schonberg

Puzzle 16 of Vienna Hard Pack

Question is: Music Style Founded by Viennese Composer Schonberg

and the answer is: SERIALISM

Word Meaning:

SERIALISM — (music) Music, especially from the 20th century, in which themes are based on a definite order of notes of an equal-tempered scale.

Definitions from Wiktionary.