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Dublin's busy Grafton Street came to a standstill on Christmas Eve when U2's Bono and a trio of superstar buskers gathered to give stunned holiday shoppers a once-in-a-lifetime treat.

U2's Bono, Glen Hansard, Damien Rice and Mundy made up the group, which joined other volunteers on Grafton Street raising money for charity. The group did three songs, and the performance was met with hoots and applause from grateful ad astonished residents and tourists.

The superstar buskers played Bob Dylan's "Knockin' on Heaven's Door" and "You Ain't Goin' Nowhere," as well as Mic Christopher's "Heyday."

"Unreal!" exclaimed just-arrived U.S. tourist Patrick Farrell. "I was supposed to meet my family to check-in at our hotel over an hour ao, but when I saw Bono and the other stars, I had to stop. Just terrific! Only in Ireland!"

Farrell said he donated $20 to the buskers' charity.