Though Johann Sebastian Bach was one of the most prolific composers of the early eighteenth century, his output mainly fulfilled his obligation to provide music for the church. To meet the demand for secular music, he frequently recycled previous compositions. That is true of the group of harpsichord concertos, most of which are presumed to be based on lost concertos for various melody instruments composed in his younger years. In their keyboard format they form part of the composer’s most popular works, the mixture of flamboyance and vivacity proving most attractive.