Warren had a remarkably well-produced voice, with a naturally wide range, with secure high notes, and smooth, rich timbre throughout. He was most associated with Verdi, which he sang with a good deal of artistry and feel for the natural line, though he also excelled in Puccini (especially Scarpia) and verismo.
He first planned on a business career, and studied for a year at Columbia College, but in 1933 decided to quit that to pursue a singing career. He first studied at the Greenwich House Music School, and in 1935, auditioned at the Radio City Music Hall. He had hoped to be...