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Maria
Mario Lanza
Susan Graham
I believe that it is Taro Ishihara.
Shirley Bassey did a beautiful version
Over his long career he sang Ave Maria hundreds of times. He also recorded it and a quick look at the web will produce numerous examples.
Mascagni did not actually compose an Ave Maria. The intermezzo from his opera Cavalleria Rusticana was arranged as a vocal solo and the Ave Maria text was set to it. The sheet music available at www.doblinger.at
Beyonce sings it
I think it was Perry Como
Mario Lanza has sang Ave Maria in many places. He performed it during almost all of his concerts since it was his biggest hit.
Ave Maria is an Aria.
It is possible, but unlikely she ever sang it. She never recorded it. In fact she never recorded anything in German, or anything that wasn't from opera.