In the last decades of the 17th century, the five-course guitar underwent a series of transformations that changed it into the six-stringed Classic guitar. The new instrument had an expanded melodic and harmonic range and was remarkably suited to the style of music at the turn of the 19th century. Being new, the guitar did not have rauchof a tradition in the domain of chamber music in the Classical style.Its past involvement in charaber music had been limited largely to vocal and instrumental accompaniment, and to all-guitar ensembles (mostly duets and trios), The six-stringed instrument had not been consistently used in chamber ensembles involving two or more unlike...