A 1965 colour movie, Mods & Rockers is a musical filmed in the crypt of a church, where the vicar invites both groups of youngsters to a concert (bottom right image).
What could go wrong?
They end up fighting and it only stops when the police arrive.
The band is The Cheynes, a London-based group from the era and the drummer is Mick Fleetwood.
Throughout the film they play instrumentals from The Beatles.
Movie pages here.