Sure JerryK_387, easy as piece of cake.
First u make ur ogg. file 16bit, mono, Frequency 112kbps or lower, constant bitrate. Now the thing is we gonna use this music file as a speech if u want it to come from one source.
Now in the editor u put radio and in its init field u type this exec "music.sqs" and now will write a music.sqs file.
So lets say that the length of ur music file is 1:20, so u'll write
in the notepad like this
#loop
_this say "name of ur song"
~120 - //the actual lenght of the song, we use it if u want the song to loop over
goto "loop"
And thats all, but i assume u already know how to make ur own music and sounds and how to create description.ext, if not then read a tutorial, cheers