Numerous sonatas written by Johann Sebastian Bach including his Sonatas for Viola da Gamba and obbligato Harpsichord BWV 1027 - 1029 and his Six Sonatas for Violin and obbligato Harpsichord BWV 1014 - 1019 include melodic writing in both the solo part and in the right-hand keyboard part. Three distinct lines written for two instruments can easily be re-written for three instruments and Bach did this himself when he re-scored his G Major Sonata for Viola da Gamba and obbligato Harpsichord BWV 1027 for two flutes and continuo and titled it as the G Major Trio Sonata for Two Flutes and Continuo BWV 1039. This conversion process included, 1. re-scoring the solo gamba part and right-hand keyboard line for two flutes and 2. adding figured bass nomenclature to the left-hand keyboard line. In this publication the Four Obbligato Sonatas that have been converted into trios have all been similarly re-scored. However,
The solo cello or bassoon line does not include any figured bass nomenclature, and
The original right-hand writing in the second movement of Bach’s B Minor Flute Sonata titled Largo i dolce has been “elaborated”upon in order to more closely match the parity that exists between these two lines in the other movements of the same composition.