Dialogue between Lluís Domènech i Girbau and the organist Juan de la Rubia on the parallels that can be established between music and architecture. Both are abstract, reflective arts, with communication systems that could well be a project or a score. The idea of composition and architecture evokes two decisive figures in the history of the Palau: the father of the modernist building and one of the composers whose music inspired the creation of the Orfeó Català.