Egon Joseph Wellesz, CBE, FBA was an Austrian, later British composer, teacher and musicologist, notable particularly in the field of Byzantine music.

Arnold Schoenberg or Schönberg was an Austrian-American composer, music theorist, painter, teacher, and writer. Among the first modernist composers to write music of dense motivic relations saturating the musical texture, he propounded concepts like developing variation, the emancipation of the dissonance, and the "unity of musical space".