Well there's the Paolo (Maldini) Ole/Ale(?) song, which doesn't seem to have any tune to it!!!!
Then there's one to the tune of 'The Entertainer' which basically hums the tune and then shouts 'Milan' at the end of each line from what I can tell!
Apart from that, I'm sure other people will be able to help you, especially those who can speak Italian!!! Maybe they could insight us with some rude ones about juve/inter????
Forza Milan