It's 'O sole mio, which is Neapolitan. The standard Italian translation is Il sole mio. Translated to english, that's just "My sun" not "Oh my sun." http://en.wikipedia.org/wiki/'O_Sole_Mio
I don't know why I posted this, but I felt it was interesting and relevant. =)
Just a quick aside:
It's 'O sole mio, which is Neapolitan. The standard Italian translation is Il sole mio. Translated to english, that's just "My sun" not "Oh my sun." http://en.wikipedia.org/wiki/'O_Sole_Mio
I don't know why I posted this, but I felt it was interesting and relevant. =)