I first heard the song watching a ballroom dance couple from Italy dancing a Waltz to it. The dance was so beautiful because it was enhanced by the song. At the time I had no idea about the origin of the song.
Then I was browsing at Barnes and Nobles and listening to some different songs and I happened on the song again. I closed my eyes and listened. Only 30 seconds. All sorts of images and emotions passed through my mind.
I don’t know if you will feel the same way but the song is
O Mio Babbino Caro by Puccini
The singer is named Maria Callas.
Many have sung this song, but her recording is especially amazing and beautiful.
You can read more about her on Wikipedia
I hope after reading this you will try to listen to this song, and I hope you will be touched.