For loop throws "term undefined" error?

I'm trying to add a playlist to my music player, which loads by xml. I've got the text box set up, and data is added into it after the XML is done loading.

I get an error on line 32, I'll point it out later, about something being not defind.

Here is my code:

var my_songs:XMLList;
var my_total:Number;
var my_sound:Sound;
var my_channel:SoundChannel;
var current_song:Number = 0;
var song_position:Number;
var song_paused:Boolean;
var myXMLLoader:URLLoader = new URLLoader();
var songNames:Array = new Array();
songData.text = "Playlist:\n";
myXMLLoader.load(new URLRequest("playlist.xml"));
myXMLLoader.addEventListener(Event.COMPLETE, processXML);
function processXML(e:Event):void {
          var myXML:XML = new XML(e.target.data);
          my_songs = myXML.SONG;
          my_total = my_songs.length();
          //playSong(0);
          myXMLLoader.removeEventListener(Event.COMPLETE, processXML);
          myXMLLoader = null;
          setUpPlaylist();
}
function setUpPlaylist():void
{
          for (var i:int = 0; i <= my_total;i++){
                    songNames.push(String(i)+ ". "+ my_songs.@TITLE);
                    //songData.appendText("A\n");
                    songData.appendText(String(i+1)+ ". " + my_songs.@TITLE + "\n");
          }
}
function playSong(mySong:Number):void {
          var myTitle = my_songs[mySong].@TITLE;
          var myArtist = my_songs[mySong].@ARTIST;
          var myURL = my_songs[mySong].@URL;
          title_txt.text = myTitle;
          artist_txt.text = myArtist;
          if (my_channel) {
                    my_channel.stop();
                    my_channel.removeEventListener(Event.SOUND_COMPLETE, onNext);
          }
          my_sound = new Sound();
          my_sound.load(new URLRequest(myURL));
          my_channel = my_sound.play();
          my_channel.addEventListener(Event.SOUND_COMPLETE, onNext);
}
next_btn.addEventListener(MouseEvent.CLICK, onNext);
function onNext(e:Event):void {
          current_song++;
          if (current_song>=my_total) {
                    current_song=0;
          }
          playSong(current_song);
}
prev_btn.addEventListener(MouseEvent.CLICK, onPrev);
function onPrev(e:MouseEvent):void {
          current_song--;
          if (current_song<0) {
                    current_song = my_total-1;
          }
          playSong(current_song);
}
pause_btn.addEventListener(MouseEvent.CLICK, onPause);
function onPause(e:MouseEvent):void {
          if (my_channel) {
                    song_position = my_channel.position;
                    my_channel.stop();
                    song_paused=true;
          }
}
play_btn.addEventListener(MouseEvent.CLICK, onPlay);
function onPlay(e:MouseEvent):void {
          if (song_paused) {
                    my_channel = my_sound.play(song_position);
                    song_paused=false;
          } else if (!my_channel) {
                    playSong(current_song);
          }
}

This is line 32:

songNames.push(String(i)+ ". "+ my_songs.@TITLE);

Edit:

I was also wondering if It was possible to make a list of movie clips (or buttons) that could be controlled by a scroll bar.

The movie clips would have to be made through as3, with text on them (again added by as3) and then controlled through more code.