Sisto Reina is one of the many musicians from the Order of the Friars Minor Conventual who have greatly enriched the history of music. The diffusion of his music greatly exceeded the boundaries of the regions in which he was active: works of his are present in the archives of several Italian cities, and in Austria, Germany, Poland, Switzerland and England. The Armonia ecclesiastica, by Sisto Reina, published by Carlo Camagno in Milan in 1653 and dedicated to princess Angelica Luigia Mariana Gonzaga, nun in the convent of S. Paolo in Milan, is exemplary as regards the variety of forms, styles and languages that were typical of Italian seventeenth-century music, particularly in Lombardy. Michelangelo Gabrielli, Renaissance and Baroque repertoire specialist, directs the Concentus Vocum ensemble (from the Como Conservatory of Music) bringing this work to light in a world premiere recording.