A young girl is overcome by the diagnosis of her illness. However, she finds the inner strength to survive and the will to fight. She climbs onto the rooftops and admonishes the sky, watched by the inhabitants of the city with outstretched hands… Luc Tartar writes: “The story of this young girl is that of everyone’s and that of ‘Humanity’”. It is also the story of another woman, elsewhere on another continent, who is going through the same situation as this young girl in a different context. This other woman’s singularity, behaviour, way of thinking, and outspokenness disturb right-thinking society. This feeling of exclusion pushes her to sing, and singing becomes her outlet. Reflecting the duality between theatre and music, La fille qui chante et la fille sur le toit offer each artistic form all the latitude necessary to compose a polyphonic stage fiction.