Albums of Jannacci with the movie's songs.

Not sure if anyone know but the two songs you're talking about are on 2 different albums of the composer Enzo Jannacci.

"Quelli che" ( Oh yeah ) in "Quelli che..." 1975
"Tira a campà" in "O vivere o ridere" 1976

I would not give political meanings to the opening song, or at least not only. In Italy the song is considered probably the best song of Jannacci and my interpretation is "anyway life goes on". It goes on for men who don't care, short minded but even for others who simply live.
Some phrases are a subtle criticism to society in general but others are a light and funny photo of everyday life.

Jannacci's songs are often this way: as the movie it self, as life.
There's time for smiling, crying and thinking.

This is my opinion, sorry for the poor english...
Guido