Trio Sonata for two Treble Recorders & Basso continuo in B-flat major (original G major) (BWV 1039)

J S Bach Trio Sonata for two Treble Recorders & Basso continuo in B-flat major (original G major) (BWV 1039) (Score & Parts)

The present arrangement of Bach's Trio Sonata BWV 1039 for two treble recorders and Basso continuo is based on the Trio Sonata in G major for two Flutes and Basso continuo.

As yet, it has been difficult to determine the date of origin of the trio sonata.  Whether Bach composed this work while employed at the court in Köthen or whether he composed the trio sonata at an earlier time is uncertain.  In addition to the version for two flutes and basso continuo, there exists another version, arranged by Bach himself, for viola da gamba and obbligato harpsichord.

The transposition from G major to B-flat major is in accordance with the third transposition (a third upwards), a technique often used in the eighteenth century.