Al Pacino with Chicago (Greek Theatre-Los Angeles)

LOS ANGELES (from the Huffington Post) — An Al Pacino movie broke out in the middle of a concert by the band Chicago, with thousands of fans serving as extras.
Cameras were wheeled onstage during intermission of the group's show at the Greek Theatre on Friday night to film a scene from Pacino's upcoming movie "Imagine," in which he plays aging rock star Danny Collins.

With coaching from the director, the crowd chanted the name of Pacino's character as the 73-year-old actor walked on stage to sing "Hey Baby Doll" in a black suit. The movie co-stars Michael Caine, Annette Bening and Jennifer Garner.

"This is an improvisation," Pacino told the crowd. "You just came in and got it. That's not easy."