The film follows four families, with different nationalities (French, German, Russian and American) but with the same passion for music, from the 1930s to the 1960s. The various story lines cross each other time and again in different places and times, with their own theme scores that evolve as time passes. The main event in the film is the Second World War, which throws the stories of the four musical families together and mixes their fates. Although all characters are fictional, many of them are loosely based on historical musical icons (Édith Piaf, Josephine Baker, Herbert von Karajan, Glenn Miller, Rudolf Nureyev, etc.) The Boléro dance sequence at the end brings all the threads together.

A bumbling film crew attempts to make a porno movie.

Midi Première is a French variety show presented by Danièle Gilbert, directed by Jacques Pierre and broadcast from January 6, 1975 until January 1, 1982 on TF1. The program was generally broadcast between 12:15 p.m. and 12:55 p.m., then giving way to the 1:00 p.m. TV news. However, the broadcast schedule could change, depending on the guests, and the setting where the recording of the program was shot. Certain performances by artists who have become cult like the one where Ringo jostles with a demonstrator in interpretation (1977), that of Dalida with the title There is always a song with the soundtrack that does not start, twice, at the right speed (1978), Claude François and his Clodettes, who, in the provinces, are unable to join "the set" in order to interpret his song, the latter being taken by the crowd of delirious fans (summer 1977) . The group Supertramp performed there with the title "Dreamer" on March 8, 1975.