I did some deeper digging and found the tape by Kevin & Brian.(Evans&Doherty) Live at The Lunenburg Folk Festival. They have it attributed to (R. Shaw) Brandy River Music. It is a very powerful song!
I have transcribed the words here as they sung it on the tape:

   Tiananmen Square
I wander alone in the shadows
As the rain falls softly on Tiananmen Square
The pale light of dawning; a new rose of morning
A promise of spring in the flowers so fair

Never forget, always remember
Sing to the glory of those who would dare
The fathers, the mothers, the sisters, the brothers
The blood red roses of Tiananmen Square

They say you can hear China's sorrow
In that great Yellow River that flows to the sea
In a land without choices the murdering voices
Call to a people who yearn to be free

Never forget, always remember
Sing to the glory of those who would dare
The fathers, the mothers, the sisters, the brothers
The blood red roses of Tiananmen Square

The eyes of the martyrs are watching
As the rain falls softly on Tiananmen Square

Never forget, always remember
Sing to the glory of those who would dare
The fathers, the mothers, the sisters, the brothers
The blood red roses of Tiananmen Square

Never forget, always remember
Sing to the glory of those who would dare
The fathers, the mothers, the sisters, the brothers
The blood red roses of Tiananmen Square

The fathers, the mothers, the sisters, the brothers
The blood red roses of Tiananmen Square

                         © R. Shaw   Brandy River Music Co.