Unfortunately the music player the SDK gives me is current;y broken: https://devforum.play.date/t/im-been-having-a-lot-of-trouble-with-the-fileplayer...
The devs hope it'll be fixed soon. Until then, WAVs won't work. MP3's will work, but I can't detect when it stops
When it gets fixed, I will likely have to convert some common/open tracks to PDA using their compiler and host them on a web page :(