Bach’s six Brandenburg Concertos are considered masterpieces and among the biggest hits of classical music. Each is written for a different combination of instruments. Concerto No. 1 requires the largest number of performers, with a string ensemble and a group of soloists. Concerto No. 5 features three solo instruments: harpsichord, violin and flute. The final piece, Cantata No. 140 for chorus and orchestra, is the famous Wachet Auf (“Sleepers Awake”), a wedding cantata depicting the uniting of Christ with the human soul.