Estelle de Pressendi, famous music-hall singer, was all the rage in the 1910s thanks to her two inseparable impresarios. Twenty years later, then on the verge of death, the singer wants to entrust her daughter Yvonne to them.

In a school for chansonniers, each student goes to the board where he says and mimes his sketch.

The Bontemps family, like all the inhabitants of the village of Coussy la Chapelle, are passionate about radio. Coco, the fiancé of Jacqueline Bontemps, participates in all the contests and under the name of Mr. Bontemps wins a beautiful Sunday. All arrive in Paris and in the premises of the Parisian Post Office attend popular broadcasts.