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diff --git a/src/commands/segment/AddTimeSignatureCommand.cpp b/src/commands/segment/AddTimeSignatureCommand.cpp
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+++ b/src/commands/segment/AddTimeSignatureCommand.cpp
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+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
+
+/*
+    Rosegarden
+    A MIDI and audio sequencer and musical notation editor.
+ 
+    This program is Copyright 2000-2008
+        Guillaume Laurent   <[email protected]>,
+        Chris Cannam        <[email protected]>,
+        Richard Bown        <[email protected]>
+ 
+    The moral rights of Guillaume Laurent, Chris Cannam, and Richard
+    Bown to claim authorship of this work have been asserted.
+ 
+    Other copyrights also apply to some parts of this work.  Please
+    see the AUTHORS file and individual file headers for details.
+ 
+    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; either version 2 of the
+    License, or (at your option) any later version.  See the file
+    COPYING included with this distribution for more information.
+*/
+
+
+#include "AddTimeSignatureCommand.h"
+
+#include "base/Composition.h"
+#include "base/NotationTypes.h"
+#include <qstring.h>
+
+
+namespace Rosegarden
+{
+
+AddTimeSignatureCommand::AddTimeSignatureCommand(Composition *composition,
+        timeT time,
+        TimeSignature timeSig) :
+        KNamedCommand(getGlobalName()),
+        m_composition(composition),
+        m_time(time),
+        m_timeSignature(timeSig),
+        m_oldTimeSignature(0)
+{
+    // nothing else
+}
+
+AddTimeSignatureCommand::~AddTimeSignatureCommand()
+{
+    if (m_oldTimeSignature)
+        delete m_oldTimeSignature;
+}
+
+void
+AddTimeSignatureCommand::execute()
+{
+    int oldIndex = m_composition->getTimeSignatureNumberAt(m_time);
+    if (oldIndex >= 0) {
+        std::pair<timeT, TimeSignature> data =
+            m_composition->getTimeSignatureChange(oldIndex);
+        if (data.first == m_time) {
+            m_oldTimeSignature = new TimeSignature(data.second);
+        }
+    }
+
+    m_timeSigIndex = m_composition->addTimeSignature(m_time, m_timeSignature);
+}
+
+void
+AddTimeSignatureCommand::unexecute()
+{
+    m_composition->removeTimeSignature(m_timeSigIndex);
+    if (m_oldTimeSignature) {
+        m_composition->addTimeSignature(m_time, *m_oldTimeSignature);
+    }
+}
+
+}