Cause, R* make a game with just an option during the installation to install with song or with no song.In SA we cant choose this option.
I have open all audio files with saat, and i remove 2sfx sounds (sfx is the sound from audio car engine door firegun and other shit). And without it, the game run perferctly so, i think the game need some audio files like the song in the loading of the game, and other.
Don't try to delete audio folder