Modern classical music is music written in the 20th century and beyond. Although much of it draws heavily on earlier forms, modern composers also experimented with rejection of long-held ideas; notably, Arnold Schoenberg questioned the traditional notions of harmony with his twelve-tone system[?], and John Cage questioned the very definition of music with his use of chance and found sounds.
... (33%), Alenia[?] of Italy (21%), and CASA of Spain (13%).
Over the next five years, design work continued, aided by data from the British Aerospace EAP prototype ...