Brandenburg Concertos
... Presumably, it was during this visit that he came into contact with the margrave of Brandenburg. ... It was perhaps on this occasion that bach was commissioned to compose a set on concertos for this orchestra. Though a commission from someone as influential as the margrave of Brandenburg muse have been an exceptional honour for Bach, it was quite some time before the work was completed. In fact, it was two and a half years later that Bach sent the margrave Six Concerts Avec Plusiers Instruments, works that have gone down in history as the Brandenburg Concertos.