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diff --git a/libs/evoral/evoral/types.h b/libs/evoral/evoral/types.h
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+/*
+ * Copyright (C) 2008-2012 Carl Hetherington <carl@carlh.net>
+ * Copyright (C) 2008-2016 David Robillard <d@drobilla.net>
+ * Copyright (C) 2009-2015 Paul Davis <paul@linuxaudiosystems.com>
+ *
+ * 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.
+ *
+ * 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.
+ */
+
+#ifndef EVORAL_TYPES_HPP
+#define EVORAL_TYPES_HPP
+
+#include <float.h>
+#include <math.h>
+#include <stdint.h>
+
+#include <iostream>
+#include <limits>
+#include <list>
+
+#include "evoral/visibility.h"
+#include "pbd/debug.h"
+
+namespace Evoral {
+
+/** ID of an event (note or other). This must be operable on by glib
+    atomic ops
+*/
+typedef int32_t event_id_t;
+
+/** Type of an event (opaque, mapped by application, e.g. MIDI).
+ *
+ * Event types are really an arbitrary integer provided by the type map, and it
+ * is safe to use values not in this enum, but this enum exists so the compiler
+ * can catch mistakes like setting the event type to a MIDI status byte.  Event
+ * types come from the type map and describe a format/protocol like MIDI, and
+ * must not be confused with the payload (such as a note on or CC change).
+ * There is a static value for MIDI as this type is handled specially by
+ * various parts of Evoral.
+ */
+enum EventType {
+	NO_EVENT,
+	MIDI_EVENT
+};
+
+/** Type of a parameter (opaque, mapped by application, e.g. gain) */
+typedef uint32_t ParameterType;
+
+class Beats;
+
+} // namespace Evoral
+
+namespace PBD {
+	namespace DEBUG {
+		LIBEVORAL_API extern DebugBits Sequence;
+		LIBEVORAL_API extern DebugBits Note;
+		LIBEVORAL_API extern DebugBits ControlList;
+	}
+}
+
+#endif // EVORAL_TYPES_HPP