How to stop music from playing when switching activities?

[catastrophe2]

hi

So i made a simple game app, and am implementing music now

i have easy and hard mode, and game over, as well as home screen

homesecreen now plays music1, loops fine and all...then once player selects to play i want to stop the current music1, and start music 2 in easy mode, or if they selcted hard mode, i want music3 to play. and when its gameover screen, the music should stop then play music 4 for gameover screen.

here is the code for the homescreen activity

import android.content.Intent;
import android.graphics.Typeface;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.View;
import android.view.animation.BounceInterpolator;
import android.widget.Button;
import android.widget.ImageView;

public class HomeScreenActivity extends MainGameActivity implements View.OnClickListener {

    private Button playEasyModeButton, playHardModeButton, play_pause_musicButton;
    private ImageView logoView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.home_screen_layout);

        playEasyModeButton = (Button) findViewById(R.id.playEasyMode_Button);
        playHardModeButton = (Button) findViewById(R.id.playHardMode_Button);
        logoView = (ImageView) findViewById(R.id.logo);

        play_pause_musicButton = (Button) findViewById(R.id.musicButton);
        final MediaPlayer music = MediaPlayer.create(HomeScreenActivity.this, R.raw.goldensun_rises);
        music.setLooping(true);
        music.seekTo(0);
        music.start();
        play_pause_musicButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                if (music.isPlaying())
                {
                    music.pause();
                    play_pause_musicButton.setBackgroundResource(R.drawable.music_on);
                }
                else {

                    music.start();
                    play_pause_musicButton.setBackgroundResource(R.drawable.music_off);
                }
            }
        });
    }

    @Override
    protected void setColorsOnButtons() {

    }

    @Override
    protected void calculatePoints(View view) {

    }

    public void playEasyMode(View view) {
        startActivity(new Intent(this, EasyModeActivity.class));

    }

    public void playHardMode(View view) {
        startActivity(new Intent(this, HardModeActivity.class));
    }

    @Override
    public void onClick(View view) {

    }
}

here is code for next activity (easymode activity)

public class EasyModeActivity extends MainGameActivity{

    private Button leftButton, rightButton;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.easy_mode_layout);
        setupProgressView();

        pointIncrement = 2;
        timerIncrement = 2;

        leftButton = (Button) findViewById(R.id.left_button);
        rightButton = (Button) findViewById(R.id.right_button);
        leftButton.setOnClickListener(this);
        rightButton.setOnClickListener(this);

        resetGame();
        setupGameLoop();
        startGame();
    }

    @Override
    public void onClick(View view) {
        if (!startGame) return;
        calculatePoints(view);
        setColorsOnButtons();
    }

    protected void setColorsOnButtons() {
        int color = Color.parseColor(Random_Color.getRandomColor());
        int red = Color.red(color);
        int green = Color.green(color);
        int blue = Color.blue(color);

        int alpha1, alpha2;
        if (Math.random() > 0.5) {
            alpha1 = 255;
            alpha2 = 185;
        } else {
            alpha1 = 185;
            alpha2 = 255;
        }

        leftButton.setBackgroundColor(Color.argb(alpha1, red, green, blue));
        rightButton.setBackgroundColor(Color.argb(alpha2, red, green, blue));
    }

    protected void calculatePoints(View clickedView) {
        View unclickedView = clickedView == leftButton ? rightButton : leftButton;
        ColorDrawable clickedColor = (ColorDrawable) clickedView.getBackground();
        ColorDrawable unClickedColor = (ColorDrawable) unclickedView.getBackground();

        int alpha1 = Color.alpha(clickedColor.getColor());
        int alpha2 = Color.alpha(unClickedColor.getColor());

        // correct color tap
        if (alpha1 < alpha2) {
            updatePoints();
        } else { // incorrect color tap
            endGame();
        }
    }
}

stop the music before starting new activity and set new mediaplayerand music on new activitys oncreate.