Sentence:  His various aesthetic postulates remain as landmarks of a house divided against itself : Supra Expressionism , Neo Paganism , Neo Classicism , Neo Romanticism , Neo Jazz , Neo Ecclesiasticism , Neo Popularism , and most recently , Post Serialism - all competing with each other within one <WSD>composer</WSD> ! 
Meaning of the word marked with <WSD> tags:  someone who composes music as a profession