There were nearly 10 million live streams of U2's concert on YouTube

"YouTube's live webcast of U2's "360" concert at the Rose Bowl on Sunday generated nearly 10 million streams across the globe, making it the single-largest streaming event in the Internet vid giant's five-year history.
"This was a big win for the YouTube community," said Chris Maxcy, YouTube's head of music partnerships.
The full-length concert vid, which runs nearly 2 1/2 hours, has since drawn more than 1 million views after three days on YouTube."
Source: Variety, 28th October 2009