With Festivals and big shows their tends to be a lot of collaborations that may not normally happen under normal circumstances, and this was one of this weekends. Brian May of Queen joined My Chemical Romance on stage to help them perform "Welcome To The Black Parade" and "We Will Rock You", the former of which is viewable at the top via Youtube user 111Cazza. According to NME the unlikely pairing came about when Gerard sent Brian an email saying:
"I wrote an email to Brian after getting his email off [producer] Rob Cavallo. There was this story that you played a show in Paris and got booed off and Freddie said, 'We’re gonna come back and be the biggest band in the world'. And after what happened to us at Reading in 2006 [when they were bottled], people would ask us, 'Are you gonna do that again? [play the festival]' and I’d go, 'Not unless we're headlining it.'"
Turns out MCR were asked to headline it this year and, well, you can see the results for yourself at the top.