What role did Johann Sebastian Bach have at the Collegium Musicum in Leipzig?

Johann Sebastian Bach served as the director of the Leipzig Collegium Musicum from 1729 to 1737, and again for a brief period starting around 1739.12

The Collegium Musicum was a student musical society dedicated to organizing public concerts, a movement that helped transition musical performance from private aristocratic settings to broader public audiences. During his tenure as director, Bach utilized these concerts as a platform for his instrumental works. Notably, he adapted several of his earlier concerti into harpsichord concerti for these performances, making him one of the first composers to write concerti for a keyboard instrument and orchestra. Additionally, his work with the group reflected his role as an innovator in chamber music, as he was among the first to utilize the harpsichordist's right hand as a true melodic part within that genre.321