Michel Levasseur is a joyous reveler who does not care about the next day. So much so that one day a bailiff bursts into his Paris apartment and seizes his furniture on behalf of Raymond Sauvaget, his landlord, a rich food industrialist. But far from resenting Sauvaget's act of hostility, Michel ... becomes his friend. Now Raymond, although prosperous, does not know how to handle women. That is why he asks Michel, a regular Casanova, to give him lessons in seduction.

After he loses a servant job when his employer's mansion burns down, a yokel makes money entertaining tourists in Breton garb, lands up appearing in a Paris show ,and meets another property owning lady, this one of dubious reputation.

The film tells the story of three presenters on Radio X, an amateur clandestine radio station.

Philippe, an employee at the Bourdinet firm, having been caught kissing Jacqueline, his boss's daughter, is fired. Some time later, Bourdinet launches a radio quiz show to boost his business. Philippe then decides to compete in the hope of telling the thousands of listeners what he thinks of the industrialist. A blow on the head having given him a gift of second sight, the competitor becomes impeccable and wins astronomical sums to the great despair of Bourdinet. Everything will work out in the end and Philippe will be able to marry Jacqueline.

A gang of broke student musicians travel to Paris to take exams. But very quickly, the lack of money pushes young people to pass themselves off as professionals during the performance. They will then win the victory!

Lionel Fribourg, a great composer (at least that's what he thinks) has a problem with his noisy environment: he can't complete his unfinished symphony. Of course there is a market for unfinished symphonies but, for all he knows, only one became famous. So he had better find a way to finish it. At long last, he comes across Agnès, a divorced woman who agrees to let him her quiet home. Lionel, full of hope, resumes work...

Professor Charles Buisson, astronomer and Nobel Prize winner, has just discovered a nova. He informs the other observatories by telephone. Just as he thinks one of them is calling back, he finds himself on the line with a young woman threatening suicide at the Ruban Bleu cabaret, if her lover hasn't joined her by midnight. Intrigued, the professor decides to go and prevent the unfortunate woman from committing suicide. One of his students, who earns her living as an understudy in a knife act, helps him in his investigation, while the school principal and a policeman suspect him of being a prankster or even of selling drugs. For the scientist, it's an opportunity to discover a world of music-hall that he'd never known before: "I thought I knew the sky chart by heart, but there's one planet that was totally unknown to me: Earth. I'll be back!

Christine, the daughter of a rich American, acquires from her father the jazz band of Ray Ventura who will be made responsible for accompanying her from morning till evening wherever she goes. From an endless number of amusing situations, the fiancée of the girl despairs. But soon the musicians rebel in in the face of the requirements of their patroness. More than a job, it is for them misery. Christine excuses them and she goes back to America with her band. Things go bad, degenerate, but the kindness of the musicians and the firmness of the fiancée of Christine really quiet down the moods of the young woman .

When a measles epidemic forces the temporary closing of a child care center, the son of a film star and her estranged husband, a concert pianist, is mistakenly delivered to a touring musician.

Once their military service is over, the instrumentalists of a regimental orchestra find themselves in civilian life and decide to run a hotel themselves on the Côte d'Azur.