You probably mean "C'e 'na Luna (Mezz' o Mare). There are several threads here about that. Look at the "Related Links" at the top of this page and you'll find them.

Here are some (the titles - the links are above:
Related threads:

Lyr Req: Lazy Mary / Luna Mezza Mare (16)
Mama Mia song (2)
Know a Good site for Italian lyrics? (& others) (33)
Tune Req: Italian Tunes (7)
Cella luna metza mada (sp.) - lyrics & sheet (4) (closed)