Thanks I really appreciate that. It will definitely work for music stored in the cloud or Apple Music playlists which are also stored in the cloud. I spent a lot of attention to this because I know many people don't store all their music locally or they may want to try some music they found on Apple Music. The only caveat is of course depending on your internet connection, each song may take some time to load. This can become frustrating if you have to wait a few seconds for every song, but the points count down will not decrease until the song has started playing. I have also made it free in celebration of WWDC 2016, so give it a try and if you don't like it you can always delete it with no money invested.
Aha thanks good to know that cloud storage music is supported but how then? I can't find it in your app to choose. Which cloud storage providers do you support? Dropbox, Google Drive, Box? It would be good to indicate this in your description in the App Store I think. I also couldn't find your app with searching for 'The Music Test' but in the end I found it with your last name added to the search.
It would also be cool if you could use third party apps like CloudBeats Pro (which I use) to open up offline stored (cloud) music from that app and use it for your The Music Test app. Their URL scheme is cloudbeats:// if it helps.