The world has not yet fully discovered the riches of the impressive music libraries and archives of Portugal. They testify to the often complex trajectories followed all over Europe by a repertoire of splendid pieces, many of them showing the extent to which the Italian style had taken root in eighteenth-century Portugal. The superb mass by Pergolesi recorded here is a highly characteristic example. But the ensemble Turicum wanted to go even further in their exploration of this repertoire, accompanying (and unjustly) unknown, such as Antonio Gallassi and David Perez, not to mention Leonardo Leo, acknowledged in his own time as a supreme master of sacred music.