Iria BGM?

No, I mean add your own Custom BGM to Iria in-game.

Oh. Such a thing would require the use of modifications to the game, not just simply adding a mp3 file to the folder. You'd have to adjust it so that a file is read upon entering the map, which isn't already done.

This actually reminds me of a question I wanted to ask someone. Would adding your own music to the files like most people be considered a mod of any sort?