Variable Passing

import greenfoot.*;  // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)

/**
 * Write a description of class GameScene here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
public class GameScene extends World
{

    public GreenfootSound bgMusic;
    /**
     * Constructor for objects of class GameScene.
     * 
     */
    public GameScene()
    {    
        // Create a new world with 600x400 cells with a cell size of 1x1 pixels.
        super(600, 400, 1); 
        bgMusic = new GreenfootSound("gameSceneMusic.mp3");
    }
    
    /**
     *  Method to play the background music in the game scenes
     */
    public void playSound()
    {
        bgMusic.playLoop();
    }// end method playSound
    
}

import greenfoot.*;

public class TitleScreen extends World
{
    static TitleScreen titleScreen;
    
    GreenfootSound bgMusic = new GreenfootSound("gameSceneMusic.mp3");
    ResultsScene resultsScene;
    BariatricSurgery bariatricScene;
    InsanityPlea insanityScene;
    
    public TitleScreen()
    {
        titleScreen = this;
        bariatricScene = new BariatricSurgery();
        insanityScene = new InsanityPlea();
    }
    
    public void showResults()
    {
        resultsScene = new ResultsScene();
        Greenfoot.setWorld(resultsScene);
        bgMusic.stop();
        Greenfoot.stop();
    }
}