Here's one from one of my missions, which works
class CfgMusic // Overall class name
{
tracks[]={cossack.ogg}; // declaring the music file's name
class cossack // the actual declaration
{
name = "Cossack Patrol";
sound[] = {\music\cossack.ogg, db+30, 1.0}; // declares which ogg
};
};
Notice the difference in the tracks line