Though regarded as the outstanding composers of the early eighteenth century, Johann Sebastian Bach was not averse to ‘borrowing’ from his own works to create another score. His outstanding group of harpsichord concertos, for one or multiple instruments, are all, to some extent, derived from his previously composed material for other instruments. His passion for this genre of music extended to an arrangement for four harpsichords of a quadruple violin concerto by Vivaldi. This disc provides a unique opportunity to compare the two scores.