Thousands attend NYC concert highlighting poverty

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K'naan kicked off a free concert in Central Park on Saturday evening that also included performances by Black Keys and John Legend to call attention to poverty worldwide.

Dubbed the Global Citizen Festival, the concert lineup featured Neil Young, Band of Horses and Foo Fighters as well. Video of the event was streamed worldwide as about 60,000 music fans poured into the park.

The concert included a surprise appearance from Legend, who played "Imagine" at a piano on the Great Lawn stage, a short walk from where the song's author, John Lennon, once lived.