Hidden among the layout of some of the oldest streets in the old city, is the Basilica of the Holy Martyrs Santos Justo y Pastor. Recent archaeological finds have allowed us to delve into the origin of the church and conclude that in Sant Just, like the Cathedral, there would have been an uninterrupted Christian worship since the 4th century. On this occasion, it will be the scene of a surprise concert, as protagonists María Altadill and Santi Mirón, of old music with the collaboration of Lux Fundación with a solidarity fund in favor of Fundación Raíces.