Preload External mp3s - HELP!

I am somewhat of an AS noob, so bear with me. I have a preloader already on my flash movie that basically just preloads the movie.


bytes_loaded = Math.round(_root.getBytesLoaded());
bytes_total = Math.round(_root.getBytesTotal());
getPercent = bytes_loaded/bytes_total;
_root.loadBar._width = getPercent*100;
_root.loadText = Math.round(getPercent*100)+"%";
if (bytes_loaded == bytes_total) {
    gotoAndPlay("start-fade");
}

Along with this movie, I have about 25 mp3 files that are used for voice over (the movie is a sort of tutorial). The files total about 6mb combined.

How would I include these mp3 files in the preloader so that when I call them (using loadSound) later on in the movie, they don’t skip when they start playing?