Someone says this is on Columbia Records' complete box set of Frank Sinatra's output, but the uploader says she found it in Berlin after searching everywhere for it.
It's the song called "Luna Rossa" with which Mario Frangoulis opens his DVD concert performance and CD, "Sometimes I Dream". It's a stellar studio recording. To me, Frank's voice could easily fit that of a classical crossover tenor. He has sung much of the classical crossover repertoire over his career.