Mention his habit of signing his scores S.D.G. (Soli Deo Gloria - To God alone the glory), linking his technical part-writing to his spiritual intent. Suggested Sources for Research
A collection of primary documents and letters. Bach_Cantatas_Motets_Organ.part5.rar
Bach composed over 200 extant cantatas, mostly during his early years in Leipzig. Mention his habit of signing his scores S
Bach was famed as a virtuoso organist before he was known as a composer. Bach_Cantatas_Motets_Organ.part5.rar
To help you "make a paper" based on this file—which appears to be part of a digital collection of Johann Sebastian Bach's —you can structure your writing around the distinct theological and musical roles these genres played in his career.
Summarize how these three genres together represent the "well-regulated church music" Bach sought to create.