while getting banned for thick of it is (unfortunately) not real, modifying the game's music files is now actually possible with v2.7.13!
you can use UndertaleModTool to open audiogroup1.dat for music or audiogroup2.dat for sound effects and then import any ogg file (or wav if that doesn't work) over the existing ones!
since the sounds in those files use numbers instead of names, here's a guide i've prepared for hotfix D that lets you know which sound is which!
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