Background Song

Hey guys, i’ve decided to add my background and background songs for Gmod 13. I’ve tried to search some tutorials on it and i found on, how to make that for Gmod 10. You making folder sound/ui and putting inside a mp3 file called gamestartup. Still, it doesnt works for Gmod 13, can ya help me with that? Thx

[editline]19th January 2013[/editline]

Anything? Why you guys reading threads if you cant answer the question!?