Antoni Puig Gairalt (L'Hospitalet de Llobregat, 1888 - Barcelona, 1935) ser a key figure in Catalan architecture, at the time of the transition from Noucentisme to the modern movement. Thanks to the discovery of his intimate diary, Marta Cervelló, who is his great-niece, offers us a biographical approach to this brilliant architect, who also stood out as a pianist. He performed alone or with Pau Casals, with Mercè Plantada or, four-handedly, with Wanda Landowska, works by Schumann, Mozart, César Frank and, above all, Bach.