Italian Song About Pizza?

My nana's funeral is coming up.:( She was a very happy woman who came straight from Italy when she was about 20. I was her first grand child. When i was young and before she got sick she used to sing to two songs in Italian. One was kind of long to help me go to sleep...something that had to go with Catholics (which we are), and another song about "pizza pie in the sky" or something (I could only catch a few words). She'd sing it once in Italian and again in English. It was a short, playful song which she used to sing while she pushed me on the swings. If you have any idea to what it may be please help!!!