This set of variations after the famous theme "O che nuovo miracolo", also called "Ballo del Gran Duca", composed by Emilio de' Cavalieri to be sung, played and danced at the end of the "Intermedii e balli" of the theatre play "La pellegrina", that took place in occasion of the marriage of Ferdinando de'Medici and Cristina of Lorraine, Firenze, 1589. This set of variations composed by Santiago de Murcia is included in the manuscript called "Códice Saldívar 4", dated 1732, and found in Mexico in 1940 by the musicologist Gabriel Saldívar. Gabriel Schebor plays a 5 course guitar built by Sebastián Núñez after an original by Joseph Massaguer (Barcelona, 1758)