Reunited with the cast in Theresienstadt, Krása reconstructed the full score of the opera, based on memory and the partial piano score that remained in his hands, adapting it to suit the musical instruments available in the camp: flute, clarinet, guitar, accordion, piano, percussion, four violins, a cello and a double bass. A set was once again designed by František Zelenka, formerly a stage manager at the Czech National Theatre: several flats were painted as a background, in the foreground was a fence with drawings of the cat, dog and sparrow and holes for the singers to insert their heads in place of the animals' heads. On 23 September 1943, "Brundibár" premiered in Theresienstadt. The production was directed by Zelenka and choreographed by Camilla Rosenbaum, and was shown 55 times in the following year.