diff --git a/stepmania/src/NoteData.cpp b/stepmania/src/NoteData.cpp
index 3d9677268c..d4dae09f33 100644
--- a/stepmania/src/NoteData.cpp
+++ b/stepmania/src/NoteData.cpp
@@ -788,6 +788,24 @@ bool NoteData::GetNextTapNoteRowForTrack( int track, int &rowInOut ) const
 	return true;
 }
 
+bool NoteData::GetPrevTapNoteRowForTrack( int track, int &rowInOut ) const
+{
+	const TrackMap &mapTrack = m_TapNotes[track];
+
+	/* Find the first note >= rowInOut. */
+	TrackMap::const_iterator iter = mapTrack.lower_bound( rowInOut );
+
+	/* If we're at the beginning, we can't move back any more. */
+	if( iter == mapTrack.begin() )
+		return false;
+
+	/* Move back by one. */
+	--iter;	
+	ASSERT( iter->first < rowInOut );
+	rowInOut = iter->first;
+	return true;
+}
+
 bool NoteData::GetNextTapNoteRowForAllTracks( int &rowInOut ) const
 {
 	int iClosestNextRow = 999999;
diff --git a/stepmania/src/NoteData.h b/stepmania/src/NoteData.h
index 761b75aa07..24c19bf22e 100644
--- a/stepmania/src/NoteData.h
+++ b/stepmania/src/NoteData.h
@@ -67,6 +67,7 @@ public:
 	// index > afterRow.
 	bool GetNextTapNoteRowForTrack( int track, int &rowInOut ) const;
 	bool GetNextTapNoteRowForAllTracks( int &rowInOut ) const;
+	bool GetPrevTapNoteRowForTrack( int track, int &rowInOut ) const;
 	
 	void MoveTapNoteTrack( int dest, int src );
 	void SetTapNote( int track, int row, const TapNote& tn );