it doesnt work, i have the postal 2 music mod downloaded and i tried (so hard and got so far) everything but it wont work

what is the original addon

this is my first addon
and here is instructions if you want your own
how to make your own spawnmenu music addon?
1. make sure the original mod is installed
2. create a folder and put it in addons
3. create another folder inside and name it sound
4. create another folder inside the sound folder named mods_music
5. place any song you like!
6. launch the game and access spawnmenu music in options and if you have multiple songs, you can choose whichever you like.