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diff --git a/src/commands/edit/TransposeCommand.cpp b/src/commands/edit/TransposeCommand.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 "TransposeCommand.h"
+
+#include <iostream>
+#include "base/NotationTypes.h"
+#include "base/Selection.h"
+#include "document/BasicSelectionCommand.h"
+#include <qstring.h>
+#include "base/BaseProperties.h"
+
+
+namespace Rosegarden
+{
+
+using namespace BaseProperties;
+using namespace Accidentals;
+
+void
+TransposeCommand::modifySegment()
+{
+    EventSelection::eventcontainer::iterator i;
+    
+    for (i = m_selection->getSegmentEvents().begin();
+            i != m_selection->getSegmentEvents().end(); ++i) {
+        
+        if ((*i)->isa(Note::EventType)) {
+            
+            if (m_diatonic)
+            { 
+            
+                Pitch oldPitch(**i);
+        
+                timeT noteTime = (*i)->getAbsoluteTime();
+                Key key = m_selection->getSegment().getKeyAtTime(noteTime);
+                Pitch newPitch = oldPitch.transpose(key, m_semitones, m_steps);
+                Event * newNoteEvent = newPitch.getAsNoteEvent(0, 0);
+                Accidental newAccidental;
+                newNoteEvent->get<String>(BaseProperties::ACCIDENTAL, newAccidental);
+
+                (*i)->set<Int>(PITCH, newPitch.getPerformancePitch());
+                (*i)->set<String>(ACCIDENTAL, newAccidental);
+            }
+            else
+            {
+                try {
+                    long pitch = (*i)->get<Int>(PITCH);
+                    pitch += m_semitones;
+                    (*i)->set<Int>(PITCH, pitch);
+                    if ((m_semitones % 12) != 0) {
+                        (*i)->unset(ACCIDENTAL);
+                    }
+                } catch (...) { }
+            }
+
+        }
+    }
+}
+
+}