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diff --git a/muse2/muse/trackdrummapupdater.cpp b/muse2/muse/trackdrummapupdater.cpp
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+++ b/muse2/muse/trackdrummapupdater.cpp
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+//=========================================================
+//  MusE
+//  Linux Music Editor
+//  $Id: trackdrummapupdater.cpp,v 1.59.2.52 2011/12/27 20:25:58 flo93 Exp $
+//
+//  (C) Copyright 2011 Florian Jung (florian.a.jung (at) web.de)
+//
+//  This program is free software; you can redistribute it and/or
+//  modify it under the terms of the GNU General Public License
+//  as published by the Free Software Foundation; version 2 of
+//  the License, or (at your option) any later version.
+//
+//  This program is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//  GNU General Public License for more details.
+//
+//  You should have received a copy of the GNU General Public License
+//  along with this program; if not, write to the Free Software
+//  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+//
+//=========================================================
+
+#include "trackdrummapupdater.h"
+#include "song.h"
+#include "globals.h"
+
+namespace MusECore {
+
+using MusEGlobal::song;
+
+TrackDrummapUpdater::TrackDrummapUpdater()
+{
+  connect(song,SIGNAL(songChanged(int)), this, SLOT(songChanged(int)));
+}
+
+void TrackDrummapUpdater::songChanged(int flags)
+{
+  if (flags & (SC_TRACK_INSERTED | SC_TRACK_REMOVED | SC_TRACK_MODIFIED |
+               SC_PART_INSERTED  | SC_PART_REMOVED  | SC_PART_MODIFIED  |
+               SC_EVENT_INSERTED | SC_EVENT_REMOVED | SC_EVENT_MODIFIED ) )
+  {
+    bool changed=false;
+    for (iTrack t=song->tracks()->begin(); t!=song->tracks()->end(); t++)
+    {
+      MidiTrack* track=dynamic_cast<MidiTrack*>(*t);
+      if (track && track->auto_update_drummap())
+        changed=true;
+    }
+    
+    if (changed)
+    {
+      // allow recursion. there will be no more recursion, because this
+      // is only executed when something other than SC_DRUMMAP happens
+      song->update(SC_DRUMMAP, true); 
+    }
+    
+  }
+}
+
+} //namespace MusECore