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diff --git a/src/base/SegmentMatrixHelper.h b/src/base/SegmentMatrixHelper.h
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+// -*- c-basic-offset: 4 -*-
+
+/*
+    Rosegarden
+    A sequencer and musical notation editor.
+
+    This program is Copyright 2000-2008
+        Guillaume Laurent   <glaurent@telegraph-road.org>,
+        Chris Cannam        <cannam@all-day-breakfast.com>,
+        Richard Bown        <bownie@bownie.com>
+
+    The moral right of the authors to claim authorship of this work
+    has been asserted.
+
+    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.
+*/
+
+#ifndef _SEGMENT_MATRIX_HELPER_H_
+#define _SEGMENT_MATRIX_HELPER_H_
+
+#include "SegmentNotationHelper.h"
+
+namespace Rosegarden 
+{
+
+class SegmentMatrixHelper : protected SegmentNotationHelper
+{
+public:
+    SegmentMatrixHelper(Segment &t) : SegmentNotationHelper(t) { }
+
+    iterator insertNote(Event *);
+
+    /**
+     * Returns true if event is colliding another note in percussion
+     * matrix (ie event is a note and has the same start time and the
+     * same pitch as another note).
+     */
+    bool isDrumColliding(Event *);
+
+    using SegmentHelper::segment;
+    using SegmentNotationHelper::deleteEvent;
+    using SegmentNotationHelper::deleteNote;
+
+};
+
+
+}
+
+#endif