Singing Bach’s Motets this summer, what should I read/watch?

I’m singing in a choir this summer that’s performing all of Bach’s motets, and I’d love to use this opportunity to deep dive and learn as much as I can about him!

What are your favorite books, documentaries, movies, podcasts, YouTube channels, or other resources about Bach? I’d love recommendations that explore who he was as a person, the musical world he lived in, and the impact he had on music as we know it.

Thank you!