While the existing score is in the form of a concerto for harpsichord and strings, Bach scholars believe it to be a transcription of a lost double concerto in D minor; a reconstructed arrangement of this concerto for two violins or violin and oboe is classified as BWV 1060R.[3] The subtle and masterful way in which the solo instruments blend with the orchestra marks this out as one of the most mature works of Bach's years at Köthen. The middle movement is a cantabile for the solo instruments with orchestral accompaniment.