The backstory to that (free) performance is great:
https://hmmagazine.com/rage-against-the-machine-live-at-finsbury-park/
"In 2005, a man named Shayne Ward won the second season of The X Factor, the U.K. equivalent of American Idol, and his rise to fame would also include grabbing the Christmas number one with “That’s My Goal.” It would turn out to be the first of four straight years of X Factor singles winning the popular tradition. But in 2009, an English DJ and his wife, Jon and Tracy Morter, had had enough and created a campaign to make the anthem “Killing in the Name” the Christmas number one, an effort to break the streak. The band supported the cause, promising a free concert if the campaign was successful, and — quite literally against all odds — the band’s single outsold X Factor winner Joe McElderry’s version of Miley Cyrus’ “The Climb,” selling 502,672 copies to McElderry’s 450,838.
Live at Finsbury Park is that free concert. The band would even go on to donate 100% of the profits of the sale of “Killing in the Name” to the homeless humanitarian effort, Shelter, presenting a six-figure check to the nonprofit during the show."