Who said "Music that does not challenge does not endure."?

This quote is attributed to Pierre Boulez.

Music that does not challenge does not endure. - Pierre Boulez

"Music that does not challenge does not endure."

Pierre Boulez Perseverance

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."

"Perseverance is the key to success."

"Don't give up on what you believe in."

"I've been through worse."

"You learn to live with the pain."