diff --git a/src/de/ctdo/crashtest/mpd/IMPDController.java b/src/de/ctdo/crashtest/mpd/IMPDController.java
index 275b72c..1b5861e 100644
--- a/src/de/ctdo/crashtest/mpd/IMPDController.java
+++ b/src/de/ctdo/crashtest/mpd/IMPDController.java
@@ -7,4 +7,6 @@ package de.ctdo.crashtest.mpd;
 public interface IMPDController {
     void playSong(final String artist, final String title);
     void setVolume(final int volume);
+    void clearPlaylist();
+    void addToPlayList(final String artist, final String title);
 }
diff --git a/src/de/ctdo/crashtest/mpd/MPDController.java b/src/de/ctdo/crashtest/mpd/MPDController.java
index 6d80daf..8eb38e5 100644
--- a/src/de/ctdo/crashtest/mpd/MPDController.java
+++ b/src/de/ctdo/crashtest/mpd/MPDController.java
@@ -20,6 +20,7 @@ import java.util.List;
  */
 public class MPDController implements  IMPDController {
     private MPD mpd;
+    private final Object lockObject = new Object();
 
     public MPDController(String host) {
         try {
@@ -46,7 +47,6 @@ public class MPDController implements  IMPDController {
                     addToPlayListIfNeeded(artist, title);
 
                     try {
-
                         MPDPlaylist playlist = mpd.getMPDPlaylist();
 
                         for(MPDSong song: playlist.getSongList()) {
@@ -71,36 +71,48 @@ public class MPDController implements  IMPDController {
                 }
             };
 
-            synchronized (mpd) {
+            synchronized (lockObject) {
                 new Thread(r).start();
             }
         }
     }
-    
-    private void addToPlayListIfNeeded(final String artist, final String title) {
-        MPDDatabase db = mpd.getMPDDatabase();
-        MPDPlaylist playlist = mpd.getMPDPlaylist();
 
-        try {
-            List<MPDSong> tracks = new ArrayList<MPDSong>(db.findArtist(artist));
+    /**
+     * Add a song to current mpd playlist
+     * @param artist Artist of the track to play
+     * @param title  Title of the track to play
+     */
+    @Override
+    public void addToPlayList(final String artist, final String title) {
+        if(mpd != null) {
+            Runnable r = new Runnable() {
+                @Override
+                public void run() {
+                    MPDDatabase db = mpd.getMPDDatabase();
+                    MPDPlaylist playlist = mpd.getMPDPlaylist();
 
-            for(MPDSong song: tracks) {
-                if(song.getName() != null &&
-                   song.getName().toLowerCase().contains(title.toLowerCase())) {
+                    try {
+                        List<MPDSong> tracks = new ArrayList<MPDSong>(db.findArtist(artist));
 
-                    if(!playlist.getSongList().contains(song)) {
-                        playlist.addSong(song);
+                        for(MPDSong song: tracks) {
+                            if(song.getName() != null && song.getName().toLowerCase().contains(title.toLowerCase())) {
+                                playlist.addSong(song);
+                                break;
+                            }
+                        }
+                    } catch (MPDConnectionException e) {
+                        Logger.sLog("MPD error: " + e.getMessage());
+                    } catch (MPDDatabaseException e) {
+                        Logger.sLog("MPD error: " + e.getMessage());
+                    } catch (MPDPlaylistException e) {
+                        Logger.sLog("MPD error: " + e.getMessage());
                     }
-                    break;
                 }
-            }
+            };
 
-        } catch (MPDConnectionException e) {
-            Logger.sLog("MPD error: " + e.getMessage());
-        } catch (MPDDatabaseException e) {
-            Logger.sLog("MPD error: " + e.getMessage());
-        } catch (MPDPlaylistException e) {
-            Logger.sLog("MPD error: " + e.getMessage());
+            synchronized (lockObject) {
+                new Thread(r).start();
+            }
         }
     }
 
@@ -111,7 +123,6 @@ public class MPDController implements  IMPDController {
     @Override
     public void setVolume(final int volume) {
         if(mpd != null) {
-
             Runnable r = new Runnable() {
                 @Override
                 public void run() {
@@ -125,9 +136,60 @@ public class MPDController implements  IMPDController {
                 }
             };
 
-            synchronized (mpd) {
+            synchronized (lockObject) {
                 new Thread(r).start();
             }
         }
     }
+
+    /**
+     * Clears the current mpd playlist
+     */
+    @Override
+    public void clearPlaylist() {
+        if(mpd != null) {
+            Runnable r = new Runnable() {
+                @Override
+                public void run() {
+                    try {
+                        MPDPlaylist playlist = mpd.getMPDPlaylist();
+                        playlist.clearPlaylist();
+                    } catch (MPDConnectionException e) {
+                        Logger.sLog("MPD error: " + e.getMessage());
+                    } catch (MPDPlaylistException e) {
+                        Logger.sLog("MPD error: " + e.getMessage());
+                    }
+                }
+            };
+
+            synchronized (lockObject) {
+                new Thread(r).start();
+            }
+        }
+    }
+
+    private void addToPlayListIfNeeded(final String artist, final String title) {
+        MPDDatabase db = mpd.getMPDDatabase();
+        MPDPlaylist playlist = mpd.getMPDPlaylist();
+
+        try {
+            List<MPDSong> tracks = new ArrayList<MPDSong>(db.findArtist(artist));
+
+            for(MPDSong song: tracks) {
+                if(song.getName() != null && song.getName().toLowerCase().contains(title.toLowerCase())) {
+                    if(!playlist.getSongList().contains(song)) {
+                        playlist.addSong(song);
+                    }
+                    break;
+                }
+            }
+        } catch (MPDConnectionException e) {
+            Logger.sLog("MPD error: " + e.getMessage());
+        } catch (MPDDatabaseException e) {
+            Logger.sLog("MPD error: " + e.getMessage());
+        } catch (MPDPlaylistException e) {
+            Logger.sLog("MPD error: " + e.getMessage());
+        }
+    }
+
 }