diff --git a/core/assets/music.mp3 b/core/assets/music.mp3
new file mode 100644
index 0000000..b763bf3
Binary files /dev/null and b/core/assets/music.mp3 differ
diff --git a/core/src/netwerkprog/game/MainGame.java b/core/src/netwerkprog/game/MainGame.java
index 03bbda2..f91f753 100644
--- a/core/src/netwerkprog/game/MainGame.java
+++ b/core/src/netwerkprog/game/MainGame.java
@@ -1,7 +1,11 @@
 package netwerkprog.game;
 
 import com.badlogic.gdx.ApplicationAdapter;
+import com.badlogic.gdx.Files;
 import com.badlogic.gdx.Gdx;
+import com.badlogic.gdx.audio.Music;
+import com.badlogic.gdx.backends.lwjgl.audio.Mp3;
+import com.badlogic.gdx.graphics.Color;
 import com.badlogic.gdx.graphics.GL20;
 import com.badlogic.gdx.graphics.Texture;
 import com.badlogic.gdx.graphics.g2d.SpriteBatch;
@@ -21,11 +25,17 @@ public class MainGame extends ApplicationAdapter {
         float ratio = (float) Gdx.graphics.getWidth() / Gdx.graphics.getHeight();
         xUpdate = ratio;
         yUpdate = ratio;
+
+        // play music
+        Music music = Gdx.audio.newMusic(Gdx.files.getFileHandle("core/assets/music.mp3", Files.FileType.Internal));
+        music.setVolume(.1f);
+        music.play();
+        music.setLooping(true);
     }
 
     @Override
     public void render() {
-        Gdx.gl.glClearColor(1, 0, 0, 1);
+        Gdx.gl.glClearColor(xPos/Gdx.graphics.getWidth(), 0, 0, 1);
         Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
         batch.begin();
         updatePos();
diff --git a/core/src/netwerkprog/game/client/Client.java b/core/src/netwerkprog/game/client/Client.java
index 1ad80d4..e5bd3da 100644
--- a/core/src/netwerkprog/game/client/Client.java
+++ b/core/src/netwerkprog/game/client/Client.java
@@ -6,6 +6,7 @@ import java.io.IOException;
 import java.net.Socket;
 import java.util.Scanner;
 
+//TODO rewrite with GDX library https://www.gamefromscratch.com/post/2014/03/11/LibGDX-Tutorial-10-Basic-networking.aspx
 public class Client {
     private int port;
     private String hostname;
diff --git a/core/src/netwerkprog/game/server/Server.java b/core/src/netwerkprog/game/server/Server.java
index 5f94406..8188d3b 100644
--- a/core/src/netwerkprog/game/server/Server.java
+++ b/core/src/netwerkprog/game/server/Server.java
@@ -1,5 +1,10 @@
 package netwerkprog.game.server;
 
+import com.badlogic.gdx.Gdx;
+import com.badlogic.gdx.Net;
+import com.badlogic.gdx.net.ServerSocketHints;
+import com.badlogic.gdx.net.SocketHints;
+
 import java.io.DataInputStream;
 import java.io.DataOutputStream;
 import java.io.IOException;
@@ -8,6 +13,7 @@ import java.net.Socket;
 import java.util.ArrayList;
 import java.util.HashMap;
 
+//TODO rewrite this with the GDX library https://www.gamefromscratch.com/post/2014/03/11/LibGDX-Tutorial-10-Basic-networking.aspx
 public class Server {
     private ServerSocket serverSocket;
     private static final int PORT = 8000;
@@ -17,6 +23,7 @@ public class Server {
     public static void main(String[] args) {
         Server server = new Server();
         server.connect();
+
     }
 
     public void connect() {
diff --git a/core/src/netwerkprog/game/server/ServerClient.java b/core/src/netwerkprog/game/server/ServerClient.java
index d4bca8e..777b83a 100644
--- a/core/src/netwerkprog/game/server/ServerClient.java
+++ b/core/src/netwerkprog/game/server/ServerClient.java
@@ -5,6 +5,7 @@ import java.io.DataOutputStream;
 import java.io.IOException;
 import java.net.Socket;
 
+//TODO rewrite with GDX library https://www.gamefromscratch.com/post/2014/03/11/LibGDX-Tutorial-10-Basic-networking.aspx
 public class ServerClient implements Runnable {
     private DataInputStream in;
     private DataOutputStream out;