Bach "second" Concerto for Two Harpsichords in C minor from 1736 is a transcription of his Concerto for Two Violins in D minor (BWV 1043). Bach distributed the two solo violin parts to the right hands of the two solo harpsichords and filled the left hands with elaborations of the orchestral bass, but left the actual orchestral parts untouched except to transpose them down a major second. In the opinion of some critics, the two-harpsichord concerto is an inferior adaptation of pre-existing material; they point to the congestion of the left-hand parts and to the non-sustaining character of the harpsichord as the two major faults of Bach's transcriptions. Other critics assert that the work is a brilliant adaptation and that the central Siciliano movement sounds especially lovely when played by two harpsichords.

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