Your comments

As the Zion’s Harp recordings are made for the CD series, could those recordings also be added to the app? 

(I didn’t know if that could be an issue as far as copyrights or anything?)

I agree! This would be very helpful, as currently the only way I have to identify a favorite sermon is to a) keep a list in the notes app of my phone; or, b) keep my favorites in my downloaded sermons, which takes up quite a bit of space on my very small-memory phone. It would be nice to be able to tag/favorite them without having to keep them downloaded. Would also be nice to be able to add a comment tag to remind myself why I liked that particular sermon if there was a particular topic that stood out, etc.