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Although the circumstances behind Bach’s composition of three Sonatas for harpsichord and viola da gamba (BWV 1027-29) are unknown, recent research indicates that they were most likely written in the early 1740’s, when the greatest virtuosos of the viola da gamba were long a thing of the past. No original source combines all three sonatas into a cycle, but a single score of the Sonata in G Major (BWV 1027) that details performance instructions for ornamentation and articulation supports the idea that Bach wrote the sonatas for Carl Friedrich Abel, the son of Cöthen colleague Christian Ferdinand Abel, for performance during his 1737-1743 sojourn in Leipzig.

The viola da gamba emerged in Spain during the fifteenth century, perhaps as a hybrid between the North African rebab and the Spanish vihuela de mano. With six strings and a fretted fingerboard, this novel instrument in various sizes traveled quickly to Italy and was soon being produced by master luthiers throughout the Continent and England. Bach became acquainted with the North German instruments owned by Johann Ernst von Sachsen-Weimar, and an inventory of Bach’s possessions shows that he owned a hundred-year-old English “viol” at the time of his death.

A description of a harpsichord collaborating with a viola da gamba can be found in the Trattado de glosas published by Diego Ortiz in 1533, but instead of the harpsichord simply introducing themes to the viol for further elaboration, Bach calls for the harpsichordist’s left hand to play basso continuo while the right hand acts as a melody instrument.

The Sonata in G minor (BWV 1029) differs from the other two sonatas in that it is in the three-movement Italian concerto form. From the outset, the harpsichord’s accompaniment resembles the orchestral texture of the Brandenburg Concerto no. 3 in G Major (BWV 1048). In the adagio, Bach exploits the viola da gamba’s capacity to soar in a movingly, tender way, and the final allegro deftly handles a profusion of themes.

http://youtu.be/jKBkS3eGyrI