Publisher Desc.  Bach's Three Sonatas for Viola da Gamba and Harpsichord (BWV 1027-1029) are most likely transcriptions by the composer from earlier instrumental versions of the works. The solo part in this new folio is edited for double bass using normal orchestral tuning. However, the keyboard part, including the solo line, is from an earlier violoncello edition by German cellist Julius Klengel (1859-1933).