Which Leipzig churches needed singers and musicians supplied by Johann Sebastian Bach?

As the director of church music in Leipzig, Johann Sebastian Bach was responsible for supplying singers and musicians to four churches in the city:

• Thomaskirche1
• Nikolaikirche1
• Neue Kirche1
• Peterskirche1

While part singing was required at the Thomaskirche, Nikolaikirche, and Neue Kirche, Bach personally conducted and performed his own church music only at the first two. At the Peterskirche, the choir's role was limited to leading the hymns. Additionally, Bach held responsibilities regarding musical activities at the University of Leipzig’s Paulinerkirche.12