Bach structured the cantata in seven movements. He scored the vocal parts for four soloists: soprano, alto, tenor and bass. The choral writing is in four parts, and the work can be sung with just four singers, the so-called OVPP approach. Some performances deploy more singers in the choral sections. The use of a larger choir is partly a question of balance with the relatively large instrumental forces, but there is also supporting evidence for the use of more than four singers in the score, where a marking implies that Bach envisaged the option of a vocal ensemble that is separate from the four soloists.