This chapter focuses on Boulez’s relationship to the dramatic arts and the consequences of that involvement on his life and career. He was appointed as musical director, responsible for accompanying the productions, a position he held for ten years, from 1946 to 1956. Boulez contributed to the productions as conductor in Paris and also went on tour with the Company. He was interested in the music of the countries visited especially that of Brazil for its exotic instruments and their timbres. He composed the score of the Oresteia (1955), arranged and wrote the orchestration of different scores and had the opportunity to create the Domaine Musical series of concerts. It was the beginning of his career as a conductor of prestigious orchestras but also of opera and of collaborations with famous stage directors, Wieland Wagner, Patrice Chéreau, Peter Stein and Klaus-Michael Grüber.