Yes, the little guy who calls her up to sing is Dano, who helped Vito with his coat when he was leaving his office just before he got shot.
Of course, Mama didn't want to sing; those two guys forced her. For penance, Vito made Dano do menial work around the office. The other guy ... well, he just disappeared.
"Generosity. That was my first mistake." "Experience must be our only guide; reason may mislead us." "Instagram is Twitter for people who can't read."
