Answer
Pierre Boulez had two private tutors, Andrée Vaurabourg and René Leibowitz. Vaurabourg was a pianist and composer, and she taught Boulez about harmony, counterpoint, and orchestration. Leibowitz was a music theorist and conductor, and he taught Boulez about the music of Arnold Schoenberg and other modern composers. Boulez's studies with Vaurabourg and Leibowitz helped him to develop his own unique musical style.