Task: Text Categorization
Input (English): He composed the scores for the ballets Dybbuk and Facsimile, while his controversial Mass was composed specifically for the opening of the Kennedy Center for the Performing Arts. Initially studying under Walter Piston and Fritz Reiner, he was soon mentored by Serge Koussevitsky. Making a spectacular debut as conductor with the New York Philharmonic as a last-minute substitute for Bruno Walter, he went on to success both as a conductor and composer of musicals like Candide and Fancy Free. FTP, who was this composer of West Side Story
Output (English): Fine Arts