Well it goes without saying that Callas was the most famous Tosca. Other than the great Maria, who are your favorite sopranos to sing this iconic role. I one time heard someone play me an early Tebaldi when she could sing all those high C's perfectly and it was sensational. I tried to locate that recording but what I purchased was a disappointment. Milanov was great in the role. There was a gorgeous blond American Carol Netblett I heard from the radio on a Met rebroadcast who was amazing and it must have been exciting to see such a looker in the role. Speaking of lookers, Verrett was really wonderful in the role as well. I also loved the English recording with Jane Eaglen. Nilsson would have likely have been great live and she sang it tons, but I don't like her recording.