How to stop sound from playing everytime we go to 1st frame ?*

Question

Hi everyone, my app has 3 frames and a sound playing on background so everytime i go to 1st frame the music play's over himself,
is easy to get 5 instances of the music playing at same time.
How to stop this behavior ?
Music file imported to library.
Sound Linkage: export for actionScript
Sound Linkage: export in frame 1
Any help are welcome
Flash CS6 - AIR 3.4 Android and iOS > CODE:
//sound
var bgSound:BGLoop = new BGLoop();
var channel:SoundChannel=new SoundChannel();
playMusic();
//making mute;
soundBtn.addEventListener(MouseEvent.MOUSE_UP , mute);
function mute(event:MouseEvent) {
    //removing mute function then adding unmute function to same button
    soundBtn.removeEventListener(MouseEvent.MOUSE_UP , mute);
    soundBtn.addEventListener(MouseEvent.MOUSE_UP , unMute);
    //making symbol to visible;
    soundBtn.gotoAndStop(2);
    //set the volume false;
    SoundMixer.soundTransform = new SoundTransform(0);
//making unmute
function unMute(event:MouseEvent) {
    soundBtn.removeEventListener(MouseEvent.MOUSE_UP , unMute);
    soundBtn.addEventListener(MouseEvent.MOUSE_UP , mute);
    soundBtn.gotoAndStop(1);
    //set the volume true;
    SoundMixer.soundTransform = new SoundTransform(1);
function playMusic():void {
    channel = bgSound.play();
    channel.addEventListener(Event.SOUND_COMPLETE, loopMusic);
function loopMusic(e:Event):void {
    if (channel != null) {
        channel.removeEventListener(Event.SOUND_COMPLETE, loopMusic);
        playMusic();

Answer 1

Another way to do this is to create a boolean right off the start. Lets say var createMusicTrack:Boolean and set it to true
Then load your music and start playing it and at the end of that load code add a line that sets the boolean to false so that when you come back to frame 1 the boolean will be false and the code will not load and play, but this could be problematic too. Djnr suggestion is better for your purposes.