Chris Barber's jazz band unpack their instruments and rehearse for the evening concert at the Wood Green Jazz Club in North London. Meanwhile, young working-class people - a waitress, a butcher boy, a dentist's assistant - leave their work and head for the club.

There, a crowds of youngsters are queuing to get in as the band starts playing. Teddy boys order their first pint, joke with their friends and flirt with girls while the first couples move towards the dance floor.

The friendly atmosphere is only disrupted by the arrival of a group of middle-class young people out on a "slumming night". They show off their expensive cars, suits and evening dresses and look at the working-class youngsters with amusement and contempt. When it comes to dancing, they seem less self-assured, but everybody treats them with indifference. They leave the club as the evening goes on.

On stage the band alternates boisterous jazzy tunes and slower ballads sung by a female singer. Between two songs some couples progressively get closer, hug each other and kiss. Others have a row and then make up. A girl falls asleep on her boyfriend's shoulder. On the dance floor the most active youngsters accelerate their pace and only stop jiving when the band decides to pack up. The revellers go home, exhausted but happy.