"This is for everyone that died (20 years ago) today in China."
The Cure - Faith (Rome 6-4-89 Tiananmen Square version)
"And don't forget!" (Thanks to Chris White for the suggestion)
And this blog mentions the performance, but gets every detail wrong. (Thanks Kate)
Update: The blog has been updated, and a new post has been added to correct the wrong info. (Thanks Emily)