Hiya Bob & othersI don't have any links with Co As It, but I reckon they're your best bit for finding the songs. They have quite interesting cultural nights which link people who know all kinds of things (folk songs etc!).
I don't know anything about the Associazione Napolitana (except that my Dad used to play chess there!). I doubt they're as well resourced, and probably only focus on things Neapolitan.
a piu tardi
Callie