Who said "The voice must be trained like any other instrument."?

This quote is attributed to Joan Sutherland.

The voice must be trained like any other instrument. - Joan Sutherland

"The voice must be trained like any other instrument."

Joan Sutherland Education

Opera Soprano Australian 1926–2010

"I am just a girl who loves to sing and to share that gift with others."

"The voice is a muscle that needs to be trained and respected."

"You must always strive for perfection, but you must never believe that you can achieve it."

"Hard work is the price of success."

"Education opens doors."

"Education opens doors to endless possibilities."

"I ain't got the education you got, bub."

"You can't put a price on history."