diff --git a/core/assets/sound/beat.mp3 b/core/assets/sound/beat.mp3
new file mode 100644
index 0000000..88c5fe9
Binary files /dev/null and b/core/assets/sound/beat.mp3 differ
diff --git a/core/src/netwerkprog/game/client/MainGame.java b/core/src/netwerkprog/game/client/MainGame.java
index 06ab823..016c163 100644
--- a/core/src/netwerkprog/game/client/MainGame.java
+++ b/core/src/netwerkprog/game/client/MainGame.java
@@ -36,6 +36,9 @@ import netwerkprog.game.util.graphics.TextRenderer;
 
 import java.awt.*;
 
+/**
+ * Main game class
+ */
 public class MainGame extends Game implements ClientCallback {
     SpriteBatch batch;
     float screenWidth;
@@ -68,6 +71,10 @@ public class MainGame extends Game implements ClientCallback {
     private MainGame() {
     }
 
+    /**
+     * return the instance of the main game.
+     * @return the main game
+     */
     public static MainGame getInstance() {
         if (INSTANCE == null) {
             INSTANCE = new MainGame();
@@ -113,8 +120,12 @@ public class MainGame extends Game implements ClientCallback {
         camera.update();
         setGamestate(GAMESTATE.SELECTING_FACTION);
         connectToServer();
+        playSong();
     }
 
+    /**
+     * initialize all characters.
+     */
     public void initCharacters() {
         assets.load("core/assets/characters.png", Texture.class);
         assets.finishLoading();
@@ -151,7 +162,7 @@ public class MainGame extends Game implements ClientCallback {
 
     private void playSong() {
         // play music
-        Music music = Gdx.audio.newMusic(Gdx.files.getFileHandle("core/assets/earrape.mp3", Files.FileType.Internal));
+        Music music = Gdx.audio.newMusic(Gdx.files.getFileHandle("core/assets/beat.mp3", Files.FileType.Internal));
         music.setVolume(.1f);
         music.play();
         music.setLooping(true);
diff --git a/core/src/netwerkprog/game/server/ServerClient.java b/core/src/netwerkprog/game/server/ServerClient.java
index dfc2c30..7045ec1 100644
--- a/core/src/netwerkprog/game/server/ServerClient.java
+++ b/core/src/netwerkprog/game/server/ServerClient.java
@@ -1,7 +1,7 @@
 package netwerkprog.game.server;
 
-import netwerkprog.game.util.data.connection.ConnectionData;
 import netwerkprog.game.util.data.Data;
+import netwerkprog.game.util.data.connection.ConnectionData;
 
 import java.io.IOException;
 import java.io.ObjectInputStream;