The enterprising President of the factory's Revolutionary Trade Union Movement Committee Řehák from the furniture-making cooperative Mars rashly promises before the Deputy Minister that he will make an orchestra of thirty members from their organization. At the same time, he announces the marriage of secretary Hana and Honza Toman which will take place in the as yet unused factory club. The marriage is postponed by the deputy's gift - thirty musical instruments for the band. They first have to fulfil their promise. And so the workers from Mars start rehearsing. First under the leadership of Honza Toman, and later conducted by the professional composer Karas, whose participation Hana had arranged. The novice musicians are rehearsing so painstakingly that the people from the little town can't get any sleep and therefore the musicians are sent on a holiday. They have their first public success at an unexpected performance. The holiday, devoted only to music, benefits the band. After some time, they register for the popular talent competition in Prague. A bureaucratic official wants to prevent their participation but the musicians manage to pass that obstacle as well, although somewhat untraditionally, and win the audience with their masterful performance. And Hana can marry Honza .............
================================================================