The Mass in B minor is Johann Sebastian Bach's only setting of the complete Latin text of the Ordinarium missae. Towards the end of his life, mainly in 1748 and 1749, he finished composing new sections and compiling it into a complex, unified structure. Bach structured the work in four parts: 1. * Missa 2. * Symbolum Nicenum 3. * Sanctus 4. * Osanna, Benedictus, Agnus Dei et Dona nobis pacem The four sections of the manuscript are numbered, and Bach's usual closing formula (S.D.G = Soli Deo Gloria) is found at the end of the Dona nobis pacem.