What is the fine-grained topic of the following text: When starting the Book of J collaboration, Jewlia Eisenberg and Jeremiah Lockwood realized that, in addition to their passion for Jewish liturgical traditions, they had a shared repertoire of American folk religious music. Only return the topic.
The collaboration between Jewlia Eisenberg and Jeremiah Lockwood on the Book of J and their shared passion for Jewish liturgical traditions and American folk religious music.