Playback is presented as a short rehearsal in a double sense. It is a satellite of the constellation of works that Portabella dedicates to the analysis of the "materiality" of aesthetic and cultural languages (Vampir-Cuadecuc and Miró l'Altre among others can also be understood in this manner). At the same time, he analyzes the rehearsals that Carles Santos carries out for the playback recording of a film on the work of Antoni Gaudi. The choir of the Gran Teatro del Liceu of Barcelona reads fragments from Wagner's Tannhauser, Lohengrin and the Valkyries. The film was shot in the theater "Lluísos de Grácia".