Who said "I hear the trained soprano singing in the theatre."?

This quote is attributed to Walt Whitman.

I hear the trained soprano singing in the theatre. - Walt Whitman

"I hear the trained soprano singing in the theatre."

Walt Whitman Music

Poet American 1819–1892

"Do I contradict myself? Very well then I contradict myself, (I am large, I contain multitudes.)"

"I celebrate myself, and sing myself."

"Keep your face always toward the sunshine, and shadows will fall behind you."

"The future is no more uncertain than the present."

"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."