What's the cha-cha dance number playing in the scene where Fredo's wife is dancing with another man and is too drunk to stand up?

As Michael gets revenge for the assassination attempt on his father, what opera played?

What instruments are playing the the "Fredo's Death" scene?

The young Catholic boys who sang at Michael's sons party

What's the name of the song that's playing when Michael kisses Fredo and says he knows it was him?

who sang way to your heart godfather2

Which orchestra played Guantanamera in Godfather 2 on New Year's Eve shortly before the Cuban Revolution? Thank you.

What's the song that plays when Michael is driving to Hyman Roth's house?

What is the name of the song being sung when Vito is sitting on the steps when holding baby Michael right after Vito kills Don Fanucci?