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diff --git a/libs/evoral/evoral/Beats.hpp b/libs/evoral/evoral/Beats.hpp
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+/* This file is part of Evoral.
+ * Copyright (C) 2008-2015 David Robillard <http://drobilla.net>
+ * Copyright (C) 2000-2008 Paul Davis
+ *
+ * Evoral 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.
+ *
+ * Evoral 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 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 St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef EVORAL_BEATS_HPP
+#define EVORAL_BEATS_HPP
+
+#include <float.h>
+#include <math.h>
+#include <stdint.h>
+
+#include <iostream>
+#include <limits>
+
+#include "evoral/visibility.h"
+
+namespace Evoral {
+
+/** Musical time in beats. */
+class /*LIBEVORAL_API*/ Beats {
+public:
+	LIBEVORAL_API static const double PPQN;
+
+	Beats() : _time(0.0) {}
+
+	/** Create from a real number of beats. */
+	explicit Beats(double time) : _time(time) {}
+
+	/** Create from an integer number of beats. */
+	static Beats beats(int32_t beats) {
+		return Beats((double)beats);
+	}
+
+	/** Create from ticks at the standard PPQN. */
+	static Beats ticks(uint32_t ticks) {
+		return Beats(ticks / PPQN);
+	}
+
+	/** Create from ticks at a given rate.
+	 *
+	 * Note this can also be used to create from frames by setting ppqn to the
+	 * number of samples per beat.
+	 */
+	static Beats ticks_at_rate(uint64_t ticks, uint32_t ppqn) {
+		return Beats((double)ticks / (double)ppqn);
+	}
+
+	Beats& operator=(const Beats& other) {
+		_time = other._time;
+		return *this;
+	}
+
+	Beats round_up_to_beat() const {
+		return Evoral::Beats(ceil(_time));
+	}
+
+	Beats round_down_to_beat() const {
+		return Evoral::Beats(floor(_time));
+	}
+
+	Beats snap_to(const Evoral::Beats& snap) const {
+		return Beats(ceil(_time / snap._time) * snap._time);
+	}
+
+	inline bool operator==(const Beats& b) const {
+		/* Acceptable tolerance is 1 tick. */
+		return fabs(_time - b._time) <= (1.0 / PPQN);
+	}
+
+	inline bool operator==(double t) const {
+		/* Acceptable tolerance is 1 tick. */
+		return fabs(_time - t) <= (1.0 / PPQN);
+	}
+
+	inline bool operator==(int beats) const {
+		/* Acceptable tolerance is 1 tick. */
+		return fabs(_time - beats) <= (1.0 / PPQN);
+	}
+
+	inline bool operator!=(const Beats& b) const {
+		return !operator==(b);
+	}
+
+	inline bool operator<(const Beats& b) const {
+		/* Acceptable tolerance is 1 tick. */
+		if (fabs(_time - b._time) <= (1.0 / PPQN)) {
+			return false;  /* Effectively identical. */
+		} else {
+			return _time < b._time;
+		}
+	}
+
+	inline bool operator<=(const Beats& b) const {
+		return operator==(b) || operator<(b);
+	}
+
+	inline bool operator>(const Beats& b) const {
+		/* Acceptable tolerance is 1 tick. */
+		if (fabs(_time - b._time) <= (1.0 / PPQN)) {
+			return false;  /* Effectively identical. */
+		} else {
+			return _time > b._time;
+		}
+	}
+
+	inline bool operator>=(const Beats& b) const {
+		return operator==(b) || operator>(b);
+	}
+
+	inline bool operator<(double b) const {
+		/* Acceptable tolerance is 1 tick. */
+		if (fabs(_time - b) <= (1.0 / PPQN)) {
+			return false;  /* Effectively identical. */
+		} else {
+			return _time < b;
+		}
+	}
+
+	inline bool operator<=(double b) const {
+		return operator==(b) || operator<(b);
+	}
+
+	inline bool operator>(double b) const {
+		/* Acceptable tolerance is 1 tick. */
+		if (fabs(_time - b) <= (1.0 / PPQN)) {
+			return false;  /* Effectively identical. */
+		} else {
+			return _time > b;
+		}
+	}
+
+	inline bool operator>=(double b) const {
+		return operator==(b) || operator>(b);
+	}
+
+	Beats operator+(const Beats& b) const {
+		return Beats(_time + b._time);
+	}
+
+	Beats operator-(const Beats& b) const {
+		return Beats(_time - b._time);
+	}
+
+	Beats operator+(double d) const {
+		return Beats(_time + d);
+	}
+
+	Beats operator-(double d) const {
+		return Beats(_time - d);
+	}
+
+	Beats operator-() const {
+		return Beats(-_time);
+	}
+
+	template<typename Number>
+	Beats operator*(Number factor) const {
+		return Beats(_time * factor);
+	}
+
+	Beats& operator+=(const Beats& b) {
+		_time += b._time;
+		return *this;
+	}
+
+	Beats& operator-=(const Beats& b) {
+		_time -= b._time;
+		return *this;
+	}
+
+	double   to_double()              const { return _time; }
+	uint64_t to_ticks()               const { return lrint(_time * PPQN); }
+	uint64_t to_ticks(uint32_t ppqn)  const { return lrint(_time * ppqn); }
+
+	uint32_t get_beats() const { return floor(_time); }
+	uint32_t get_ticks() const { return (uint32_t)lrint(fmod(_time, 1.0) * PPQN); }
+
+	bool operator!() const { return _time == 0; }
+
+	static Beats min()  { return Beats(DBL_MIN); }
+	static Beats max()  { return Beats(DBL_MAX); }
+	static Beats tick() { return Beats(1.0 / PPQN); }
+
+private:
+	double _time;
+};
+
+extern LIBEVORAL_API const Beats MaxBeats;
+extern LIBEVORAL_API const Beats MinBeats;
+
+/*
+  TIL, several horrible hours later, that sometimes the compiler looks in the
+  namespace of a type (Evoral::Beats in this case) for an operator, and
+  does *NOT* look in the global namespace.
+
+  C++ is proof that hell exists and we are living in it.  In any case, move
+  these to the global namespace and PBD::Property's loopy
+  virtual-method-in-a-template will bite you.
+*/
+
+inline std::ostream&
+operator<<(std::ostream& os, const Beats& t)
+{
+	os << t.to_double();
+	return os;
+}
+
+inline std::istream&
+operator>>(std::istream& is, Beats& t)
+{
+	double beats;
+	is >> beats;
+	t = Beats(beats);
+	return is;
+}
+
+} // namespace Evoral
+
+namespace PBD {
+	namespace DEBUG {
+		LIBEVORAL_API extern uint64_t Beats;
+	}
+}
+
+namespace std {
+	template<>
+	struct numeric_limits<Evoral::Beats> {
+		static Evoral::Beats min() { return Evoral::Beats::min(); }
+		static Evoral::Beats max() { return Evoral::Beats::max(); }
+	};
+}
+
+#endif // EVORAL_BEATS_HPP