Great mod! I was having trouble figuring out how to follow the instructions when using Vita3k, so I ended up just overwriting the normal game files with the resources in your second zip file. This seems to have largely worked, though I get some odd graphical glitches in treasure rooms (and has almost certainly broken other stuff that I haven't noticed yet, lol). Thanks so much for making this!
Viewing post in TBOI I Repent - Mod for TBOI rebirth on PSVita comments
I also ended up frankensteining my own music mod by dropping in my favorite alt tracks from flash Isaac and Antibirth. My favorite add-ons the Steam version (besides item descriptions) are definitely the Soundtrack Menu/Music Callback mods, which are probably out of scope here, but a real killer feature imo :D