Who said "To compose for the human voice is to compose for the soul."?

This quote is attributed to Pierre Boulez.

To compose for the human voice is to compose for the soul. - Pierre Boulez

"To compose for the human voice is to compose for the soul."

Pierre Boulez Music

Avant-Garde Composer Conductor French 1925–2016

"Music is the vehicle for human emotion. It has always been."

"Compose yourself, and the world will compose itself."

"The serial technique is not a philosophy but a method."

"I think music is the most beautiful of all the arts."

"Music is the language of the soul."

"My music comes from my heart."

"Music transcends all language barriers."

"Music is the universal language of love."