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 in Los Angeles Friday night to film a scene from Pacino’s upcoming movie “Imagine,” in which he plays an aging rock star named  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.

 The movie co-stars Michael Caine, Annette Bening and Jennifer Garner.

 After a few takes, the crowd grew restless and there was scattered booing for the real musicians to resume playing.

Pacino returned to the stage during Chicago’s encore and sang and danced to their hit “25 or 6 to 4.”