JavaFX How to set String values to TableView

To give some background: I now am able to load files onto my mp3 program and play them but all the values in my tableview are null?

My song class

package application;

//imports here

public class Song {
private String title;
private String artist;
private String album;
private SimpleStringProperty pTitle;
private SimpleStringProperty pArtist;
private SimpleStringProperty pAlbum;
private Media music;
private MediaPlayer mp;
private Image coverArt;

public Song(File file) {
    music = new Media(file.toURI().toString());
    music.getMetadata().addListener((Change<? extends String, ? extends Object> c) -> {
        if (c.wasAdded()) {
            if ("artist".equals(c.getKey())) {
                System.out.println(c.getKey()+":"+c.getValueAdded());
                this.pArtist = new SimpleStringProperty(c.getValueAdded().toString());
                //pArtist.set(c.getValueAdded().toString());
                artist = c.getValueAdded().toString();  
            } else if ("title".equals(c.getKey())) {
                title = c.getValueAdded().toString();
                System.out.println(c.getKey()+":"+c.getValueAdded());
            } else if ("album".equals(c.getKey())) {
                album = c.getValueAdded().toString();
                System.out.println(c.getKey()+":"+c.getValueAdded());
            } else if ("image".equals(c.getKey())) {
                coverArt = (Image) c.getValueAdded();
            }
        }
    });
    mp = new MediaPlayer(music);
    System.out.println(pArtist);
    System.out.println(artist);
    //artist = (String) mp.getMedia().getMetadata().get("artist");
    //title = (String) music.getMetadata().get("title");
    //album = (String) music.getMetadata().get("album");
    //artist = "test";
    //album = "test";
    //title = "test";
}

public void play() {
    mp.play();
}

public void pause() {
    mp.pause();
}

public void stop() {
    mp.stop();
}

public String getTitle(){
    return title;
}

public void setTitle(String title){
    this.title = title;
}

public String getArtist(){
    return artist;
}

public void setArtist(String artist){
    this.artist = artist;
}

public String getAlbum(){
    return album;
}

public void setAlbum(String album){
    this.album = album;
}

public Image getCover(){
    return coverArt;
}

public MediaPlayer getMP(){
    return mp;
}





}

Weirdly enough at first I thought it was because my String variables were not setting correctly and were set to null since it shows as null in the console when I put these print lines to test it when the Song object is being constructed. Here is a sample of the console when I test this.

null
null
artist:Foo Fighters
album:Saint Cecilia EP
title:Saint Cecilia

Here is my controller class

public class SceneController implements Initializable{
@FXML
private Button stopBtn;
@FXML
private Slider volume;
@FXML
private Button loadBtn;
@FXML
private Button playBtn;
@FXML
private TableView<Song> table;
@FXML
private Label label;
@FXML
private ProgressBar proBar;
private TableColumn songCol,artistCol,albumCol;
ObservableList<Song> songList = FXCollections.observableArrayList();
List<File> list;
FileChooser fileChooser = new FileChooser();
Desktop desktop;
Song mySong;



@Override
public void initialize(URL arg0, ResourceBundle arg1) {
    TableColumn songCol = new TableColumn("Song");
    TableColumn artistCol = new TableColumn("Artist");
    TableColumn albumCol = new TableColumn("Album");

    songCol.setCellValueFactory(
            new PropertyValueFactory<Song,String>("Title"));
    //songCol.setCellFactory(new Callback);
    artistCol.setCellValueFactory(
            new PropertyValueFactory<Song,String>("Artist"));
    albumCol.setCellValueFactory(
            new PropertyValueFactory<Song,String>("Album"));
    volume.setMin(0);
    volume.setMax(100);
    volume.setValue(100);
    volume.valueProperty().addListener(new InvalidationListener() {
        @Override
        public void invalidated(Observable observable) {
            mySong.getMP().setVolume(volume.getValue()/100.0);
        }

    });

}

// Event Listener on Button[#loadBtn].onAction
@FXML
public void loadFile(ActionEvent event) {
    Node source = (Node) event.getSource();
    Window theStage = source.getScene().getWindow();
    //set fileChooser filter
    FileChooser.ExtensionFilter extFilter = new FileChooser.ExtensionFilter("MP3 files", "*.mp3");
    fileChooser.getExtensionFilters().add(extFilter);
    fileChooser.setTitle("Select MP3 files");
    //File file = fileChooser.showOpenDialog(theStage);
    //mySong = new Song(file);
    list = fileChooser.showOpenMultipleDialog(theStage);
    if(list!=null){
        for(File x: list) {
            mySong = new Song(x);
            System.out.println(mySong.getTitle());
            songList.add(mySong);
        }
    }
    table.setItems(songList);
}

@FXML
public void playSong(ActionEvent event) {
    mySong.play();
}

@FXML
public void stopSong(ActionEvent event) {
    //mySong.pause();
    System.out.println("song title: "+mySong.getArtist()+mySong.getTitle());
    ImageView img = new ImageView(mySong.getCover());
    //img.fitWidthProperty().bind(label.widthProperty());
    //img.fitHeightProperty().bind(label.heightProperty());
    img.setFitHeight(120);
    img.setFitWidth(200);
    label.setGraphic(img);
    //label.setGraphic(new ImageView(mySong.getCover()));
}

But I made another test print line for my "Stop" button in the controller class and after everything is loaded and I press it, it prints out the artist and title fine. I have saw this other thread and checked my getter methods and they seem to be correct? I am really lost on this and if anyone could provide some insight and a solution as to whether it is because my variables are null or my PropertyValueFactory is not done correctly

Also I notice that the nulls come first even though should they not be the last thing printed since when I create a new song object in my controller class the first print lines that run are in the if statements?