From wiki:

The Concert for New York City was a benefit concert, featuring many famous musicians, that took place on October 20, 2001 at Madison Square Garden in New York City in response to the September 11, 2001 attacks. Aside from performing for charity, the concert was an attempt to honor the first responders from the New York Fire Department and New York Police Department, their families, and those lost in the attacks and those who had worked in the ongoing rescue and recovery efforts in the weeks since that time.

The concert was organized by Paul McCartney and included many of his legendary British contemporaries, including The Who, Rolling Stones bandmates Mick Jagger and Keith Richards, David Bowie, Elton John, and Eric Clapton.

Musically, the audience responded most fervently to The Who, roaring as they came on stage with a roiling “Who Are You”, drowning out the band on the famous “It’s only teenage wasteland” refrain of “Baba O’Riley,” and reaching a peak of excitement with “Won’t Get Fooled Again.” The backdrop for the band consisted of an American flag alongside the British flag, showing solidarity. Vocalist Roger Daltrey’s final words to the crowd of first responders and their families were: “We could never follow what you did.” This performance would turn out to be bassist John Entwistle’s final performance in America with the Who; he died of a heart attack only eight months later. Multi-instrumentalist Jon Carin, who had worked with the band during the group’s 1996–1997 tours, played keyboards at this performance in place of longtime keyboardist John “Rabbit” Bundrick. Zak Starkey is on drums.

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