Professional :: Loading External Audio File In Array?

I have figured out how to load an external video file - and I can play an imported audio file, but I can't seem to use either method to load an external audio file into an array.

Here is my audio code:
var tour_audio:Array = [tour1, tour2];
var my_num:Number= Math.floor(Math.random()*2);
var ChosenSound = tour_audio[my_num];
var playing:Sound = new ChosenSound();
playing.play();

Here is my video code:
var my_videos:Array=new Array ("link1.mp4", " link2.mp4", " link3.mp4", " link4.mp4");
var randomIndex = Math.floor(Math.random()*my_videos.length);
my_player.source = my_videos[randomIndex];
I tried "var tour_audio:Array = ["link1.mp3", "link2.np3"]; - but that did not work.