diff --git a/Storage/Disk/Disk.hpp b/Storage/Disk/Disk.hpp
index b23081a04..f574f2c28 100644
--- a/Storage/Disk/Disk.hpp
+++ b/Storage/Disk/Disk.hpp
@@ -53,6 +53,11 @@ class Track {
 			@returns the time jumped to.
 		*/
 		virtual Time seek_to(const Time &time_since_index_hole) = 0;
+
+		/*!
+			The virtual copy constructor pattern; returns a copy of the Track.
+		*/
+		virtual Track *clone() = 0;
 };
 
 /*!
diff --git a/Storage/Disk/PCMPatchedTrack.cpp b/Storage/Disk/PCMPatchedTrack.cpp
index 4356912c5..05ea73d1b 100644
--- a/Storage/Disk/PCMPatchedTrack.cpp
+++ b/Storage/Disk/PCMPatchedTrack.cpp
@@ -20,6 +20,18 @@ PCMPatchedTrack::PCMPatchedTrack(std::shared_ptr<Track> underlying_track) :
 	underlying_track_->seek_to(zero);
 }
 
+PCMPatchedTrack::PCMPatchedTrack(const PCMPatchedTrack &original)
+{
+	underlying_track_.reset(original.underlying_track_->clone());
+	periods_ = original.periods_;
+	active_period_ = periods_.begin();
+}
+
+Track *PCMPatchedTrack::clone()
+{
+	return new PCMPatchedTrack(*this);
+}
+
 void PCMPatchedTrack::add_segment(const Time &start_time, const PCMSegment &segment)
 {
 	std::shared_ptr<PCMSegmentEventSource> event_source(new PCMSegmentEventSource(segment));
diff --git a/Storage/Disk/PCMPatchedTrack.hpp b/Storage/Disk/PCMPatchedTrack.hpp
index 2ea8ffd04..d4cad19ed 100644
--- a/Storage/Disk/PCMPatchedTrack.hpp
+++ b/Storage/Disk/PCMPatchedTrack.hpp
@@ -26,6 +26,11 @@ class PCMPatchedTrack: public Track {
 		*/
 		PCMPatchedTrack(std::shared_ptr<Track> underlying_track);
 
+		/*!
+			Copy constructor, for Track.
+		*/
+		PCMPatchedTrack(const PCMPatchedTrack &);
+
 		/*!
 			Replaces whatever is currently on the track from @c start_position to @c start_position + segment length
 			with the contents of @c segment.
@@ -35,6 +40,7 @@ class PCMPatchedTrack: public Track {
 		// To satisfy Storage::Disk::Track
 		Event get_next_event();
 		Time seek_to(const Time &time_since_index_hole);
+		Track *clone();
 
 	private:
 		std::shared_ptr<Track> underlying_track_;
diff --git a/Storage/Disk/PCMTrack.cpp b/Storage/Disk/PCMTrack.cpp
index 0e1b401f0..9a8067f31 100644
--- a/Storage/Disk/PCMTrack.cpp
+++ b/Storage/Disk/PCMTrack.cpp
@@ -52,6 +52,11 @@ PCMTrack::PCMTrack(const PCMTrack &original) : PCMTrack()
 	segment_event_sources_ = original.segment_event_sources_;
 }
 
+Track *PCMTrack::clone()
+{
+	return new PCMTrack(*this);
+}
+
 Track::Event PCMTrack::get_next_event()
 {
 	// ask the current segment for a new event
diff --git a/Storage/Disk/PCMTrack.hpp b/Storage/Disk/PCMTrack.hpp
index ce11d7125..ad1d7093a 100644
--- a/Storage/Disk/PCMTrack.hpp
+++ b/Storage/Disk/PCMTrack.hpp
@@ -44,6 +44,7 @@ class PCMTrack: public Track {
 		// as per @c Track
 		Event get_next_event();
 		Time seek_to(const Time &time_since_index_hole);
+		Track *clone();
 
 	private:
 		// storage for the segments that describe this track