Schonberg schon·berg US/ˈʃɑnbɜrɡ/ uncommon noun 1. United States composer and musical theorist (born in Austria) who developed atonal composition (1874-1951) SynonymsArnold SchonbergSchoenbergArnold Schoenberg Related words Broader terms composer WordNet 2.1 (Princeton University). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved.