Abstract. Music has been a part of cinema for a long time, participating in the creation of meaning in the filmic discourse. This paper gathered concepts of music, film, sound and narrative, in order to draw considerations on the relationship between music and the diegesis in the short film A Casa na Esquina. The findings include that elements of the musical discourse pinpointed crucial moments of the film, such as the reveal of the title; and also, that music was used to cross boundaries of the diegesis.