Johann Sebastian Bach's Violin Concertos, BWV 1041–1043, and his six Brandenburg Concertos survive in their original instrumentation. His harpsichord concertos are mostly adaptations of concertos originally written for other solo instruments.[1]
In his early career Bach transcribed concertos by other composers for solo organ (BWV 592–596) and for solo harpsichord (BWV 972–987). Bach's Italian Concerto, composed in 1735, was one of his few works that he published during his life-time: it is an example of an unaccompanied concerto for two-manual harpsichord.