The director of the House of Culture, where they normally rehears, can provide them with everything they need, but with two conditions. First he wants them to play songs with political charge, something they have always refused to do, just for the sheer principle; second he forces them to change their talented singer and friend Vanya with his beautiful favorite, Reni, who is a mediocre singer. They arrive at the seaside hotel, where they are supposed to perform, with Reni instead of Vanya.
The head of the House of Culture, where they typically rehearse, can supply them with everything they require, but under two conditions. Firstly, he demands they perform songs with a political agenda, something they have consistently refused to do out of principle; secondly, he insists on replacing their talented singer and friend Vanya with Reni, his favorite, who is an average singer. They arrive at the seaside hotel, where they are scheduled to perform, with Reni instead of Vanya.