diff --git a/src/TimingData.cpp b/src/TimingData.cpp
index bf1d9e2819..40401d9911 100644
--- a/src/TimingData.cpp
+++ b/src/TimingData.cpp
@@ -109,6 +109,38 @@ void TimingData::SetDelayAtRow( int iRow, float fSeconds )
 	SetStopAtRow(iRow,fSeconds,true);
 }
 
+void TimingData::SetTimeSignatureAtRow( int iRow, int iNumerator, int iDenominator )
+{
+	unsigned i;
+	for( i = 0; i < m_vTimeSignatureSegments.size(); i++ )
+	{
+		if( m_vTimeSignatureSegments[i].m_iStartRow >= iRow)
+			break; // We found our segment.
+	}
+	TimeSignatureSegment &ts = m_vTimeSignatureSegments[i];
+	TimeSignatureSegment &prev = m_vTimeSignatureSegments[i-1];
+	if( i == m_vTimeSignatureSegments.size() || ts.m_iStartRow != iRow )
+	{
+		// There is no TimeSignatureSegment at the specified beat.
+		// If the TimeSignatureSegment being set differs
+		// from the last TimeSignature, create a new TimeSignatureSegment.
+		if( i == 0 || ( prev.m_iNumerator != iNumerator || prev.m_iDenominator != iDenominator ) )
+			AddTimeSignatureSegment( TimeSignatureSegment(iRow, iNumerator, iDenominator) );
+	}
+	else	// TimeSignatureSegment being modified is m_vTimeSignatureSegments[i]
+	{
+		if( i > 0  && prev.m_iNumerator == iNumerator
+		   && prev.m_iDenominator == iDenominator )
+			m_vTimeSignatureSegments.erase( m_vTimeSignatureSegments.begin()+i,
+						        m_vTimeSignatureSegments.begin()+i+1 );
+		else
+		{
+			ts.m_iNumerator = iNumerator;
+			ts.m_iDenominator = iDenominator;
+		}
+	}
+}
+
 /*
 void TimingData::SetWarpAtRow( int iRowAt, float fLengthBeats )
 {