The musical 1600's represent a period of particular ferment: the birth of opera in music, the practice of continuo playing, solo singing with instrumental accompaniment. Musical settings change as well, they are no longer small chambers for ''musica reservata'' but great rooms and theaters calling for powerful voices capable of filling them. The harp and the chitarrone are two striking examples of how ancient instruments, still nearly renaissance models, become modernized if not designed ex novo to adapt the power of their sound to these large speces.