I'm sorry, Ferrara, but I've never heard the song and I don't believe that it is ever been released in Italy. I don't know Lou Monte neither, so I'm afraid I can't find it...If you really think to send me a cassette, I will be happy to try! If I don't understand everything, there are many people from Naples that are living here in Florence and can help me.   
About geography: Naples is in Campania , which is a different region from Calabria; actually between the two there is a little piece of Basilicata, another region . Avellino is in Campania, near Naples but more to the east, in the hinterland. It's possible that the dialects of Napoli and Avellino are slightly different , but still very near- I think that the calabrese it's another matter , and a different language, more similar to Sicilian. Yet is true, as you say, that where the regions meet the languages mingles one into another.   
For what I know, when Italy was parted in two about in the middlewaist, until 1860, the south part was called " Regno delle due Sicilie" ; I can't remember any historical name of all South Italy including the word "Calabria" (but I may be wrong). Are you sure it was not some kind of joke? You know, like the maps of United Staes with New York (or Los Angeles, or another town) enormous and all the rest minuscule? There is a strong rivalry between the north and the south , in Italy... (and sadly it is still increasing-but this is another story)
paola