Music Issue

programming flash
1

Hello!
I have an issue with Music in AS3, i know i’m missing something but i don’t know what it is.
Ok, I’m making an image gallery and i decided to add background music when i ope the gallery everything is fine the music is playing fine and the buttons stop and play works pretty nice, my problem is that when i return to the first frame(picture), the music starts over again and it mixes with the music that was actually playing.<

Sorry if my english isn’t so good.

here’s the code and the .fla file

.FLA File:
http://www.mediafire.com/?i2yjzwkatye

stop();

backbtn.addEventListener(MouseEvent.CLICK, backImage);
nextbtn.addEventListener(MouseEvent.CLICK, nextImage);

function backImage(e:MouseEvent)
{
     if(this.currentFrame>1)
     {prevFrame();}
     else
     {gotoAndStop(10);}
         
}

function nextImage(e:MouseEvent){
    
    if(this.currentFrame<10)
    {nextFrame();}
    else
    {gotoAndStop(1);}
}

function reset(e:MouseEvent){
    
    gotoAndStop(1);
    
}

//Inicia el código del reproductor
var music:Sound = new Sound(new URLRequest("Organ.mp3"));
var sc:SoundChannel = music.play();

stopmsc.addEventListener(MouseEvent.CLICK, stopImage);
function stopImage(e:Event):void
{
    sc.stop();
}

playmsc.addEventListener(MouseEvent.CLICK, playImage);
function playImage(e:Event):void
{
    sc=music.play();
}