Unable To Return All Album Uris With Content Resolver

I'm making a music player, and I noticed some of the other music players on the Play Store where able to display the entire set of album covers on my phone, where some of the other

Solution 1:

I'm going to make an educated guess here. Some of these albums just don't have URIs. It's not a problem with my code. The album art located by other music players was simply pulled from the image files located within the album directories.

edit

Nope, this is only a partial answer.