I'm trying to make a radio to hint where the goal of the map is, and I'm also trying to make an easter egg song.
btw you may would want to tell me how to make a sound alias.
i dont know anything about sound aliases 

Copy a soundaliases file rename to your mapname. Makd sure you take out everything thats in it except the first line, may want to copy a line. Add the name for the sound. Next see where the file location is,change it to the sound's file location. Drag your sound to cod5\sound_assets\raw\sound\'HERE'
Add to mod.csv "sound,MAPNAME,,all_sp". Compile map. Done.
If you want to hear the sound, script in this,

sound()
{
Player = undefined;

Player playsound( "SOUND_NAME" );

}