Music Player using drag and drop title as playlist

I am trying to create a music player which has a drag and drop options for the playlist. the title has to be dragged onto a target and then this enables the music player to read the specific genre and plays it songs from the XML playlist. I dont seem to get this working. I have pasted the codes below. The music player plays only one playlist and its like after you click play and not by dragging the title. I cant drag the title too. Below are my codes for the FLA file.

import flash.events.MouseEvent;
import flash.geom.Rectangle;
import flash.net.URLLoader;
import flash.net.URLRequest;
import flash.display.MovieClip;
import flash.display.SimpleButton;
import fl.events.SliderEvent;
import flash.media.SoundTransform;

a.source="media/artist1.jpg"

var startX:Number;
var startY:Number;

var player:MovieClip = this;

var catalog:XML;

var songList:XMLList;

var songsTotal:Number;

var sound:Sound;

var soundChannel:SoundChannel;

var currentSong:Number = 0;
var songPosition:Number;

var songPaused:Boolean;

var XMLLoader:URLLoader = new URLLoader();

XMLLoader.load(new URLRequest("playlist_R&R.xml"));
XMLLoader.load(new URLRequest("playlist_reggae.xml"));
XMLLoader.load(new URLRequest("playlist_hr.xml"));

XMLLoader.addEventListener(Event.COMPLETE, processXML);

function processXML(e:Event):void {
    var anXMLplayList:XML = new XML(e.target.data);
    songList = anXMLplayList.song;
    trace(songList);
    songsTotal = songList.length();


    XMLLoader.removeEventListener(Event.COMPLETE, processXML);
    XMLLoader = null;

}

init()
///////////////// MC Drag & Drop //////////////////////

function init(){

    mc_rocknroll.buttonMode = true; 
    mc_hr.buttonMode = true;
    mc_reggae.buttonMode = true;

    mc_rocknroll.addEventListener(MouseEvent.MOUSE_DOWN, pickUp); 
    mc_rocknroll.addEventListener(MouseEvent.MOUSE_UP, dropIt); 
    mc_hr.addEventListener(MouseEvent.MOUSE_DOWN, pickUp); 
    mc_hr.addEventListener(MouseEvent.MOUSE_UP, dropIt); 
    mc_reggae.addEventListener(MouseEvent.MOUSE_DOWN, pickUp); 
    mc_reggae.addEventListener(MouseEvent.MOUSE_UP, dropIt); 
}

function pickUp (e:MouseEvent){

    var thisPiece:MovieClip = MovieClip(e.target);

    startX = thisPiece.x; 
    startY = thisPiece.y; 

    thisPiece.startDrag(true); 
    player.setChildIndex(thisPiece, player.numChildren -1); 
}

function dropIt (e:MouseEvent){ 

    //trace(square_mc.dropTarget.parent.name); 
    var thisPiece:MovieClip = MovieClip(e.target);
    thisPiece.stopDrag();

    if((thisPiece.dropTarget!=null)&&(thisPiece.dropTarget.parent.name == "target" + thisPiece.name)){

        thisPiece.x = thisPiece.dropTarget.parent.x; 
        thisPiece.y = thisPiece.dropTarget.parent.y;
        thisPiece.mouseEnabled = false;  

        thisPiece.removeEventListener(MouseEvent.MOUSE_DOWN, pickUp); 
        thisPiece.removeEventListener(MouseEvent.MOUSE_UP, dropIt);  

    }else{

        thisPiece.x = startX; 
        thisPiece.y = startY;

    }

}





function playSong(aSong:Number):void {

    // variables for the Title, Artist and associated song in the song list
    var aEra = songList[aSong].@era;
    var aTitle = songList[aSong].@title;
    var anArtist = songList[aSong].@artist;
    var aHighest = songList[aSong].@highest;
    var aYear = songList[aSong].@year;
    var aURL = songList[aSong].@url;


    era_txt.text = aEra;
    title_txt.text = aTitle;
    artist_txt.text = anArtist;
    highest_txt.text = aHighest;
    year_txt.text = aYear;


    if (soundChannel) {
        soundChannel.stop();
        soundChannel.removeEventListener(Event.SOUND_COMPLETE, onNext);
    }
    sound = new Sound();


    sound.load(new URLRequest(aURL));

    soundChannel = sound.play();
    soundChannel.addEventListener(Event.SOUND_COMPLETE, onNext);
}

next_btn.addEventListener(MouseEvent.CLICK, onNext);

function onNext(e:Event):void {

    currentSong++;

    if (currentSong>=songsTotal) {
        currentSong=0;
    }

    playSong(currentSong);
}

prev_btn.addEventListener(MouseEvent.CLICK, onPrev);
function onPrev(e:MouseEvent):void {
    currentSong--;
    if (currentSong<0) {
        currentSong = songsTotal-1;
    }
    playSong(currentSong);
}


pause_btn.addEventListener(MouseEvent.CLICK, onPause);
function onPause(e:MouseEvent):void {
    if (soundChannel) {
        songPosition = soundChannel.position;
        soundChannel.stop();
        songPaused=true;
    }
}

play_btn.addEventListener(MouseEvent.CLICK, onPlay);
function onPlay(e:MouseEvent):void {
    if (songPaused) { 
        soundChannel = sound.play(songPosition);
        songPaused=false;
    } else if (!soundChannel) {
        playSong(currentSong);
    }
}