In this version, after installing the modification, you need to run add_my_music.bat. After that, in the folder C:\Users<username>\AppData\LocalLow\Ludeon Studios\RimWorld by Ludeon Studios\AddMyMusic_data\music_is_here, leave your music and run add_my_music.bat again. After that, run rimworld, close it and load it again. After that, the music should load in the game

To add your music, you just need to drop your music into the Sounds\Gameplay\ folder and run the add_my_music.bat script. After that, the Defs\SongDefs\Songs_Gameplay.xml file will be automatically overwritten and after you enable the mod in the game, your music will appear there.