U2 have posted a clip from a recent acoustic performance of their iconic protest song Sunday Bloody Sunday online to raise awareness about the One Campaign's agit8 anti-poverty initiative. The rockers filmed the low-key footage on a New York rooftop earlier this month (Jun13), according to RollingStone.com while recording new material. During the short clip, frontman Bono breaks off to talk about the power of protest songs in his life, recalling the moment he heard classic tunes from John Lennon and Bob Marley, which suggested the world was "more malleable than you think, that things could be changed... Things did not have to be as things were." Officials at the One Campaign, which was co-founded by Bono and seeks to end extreme poverty and preventable diseases around the globe, also released a new acoustic performance of Bruce Springsteen's The Promised Land, along with clips of Elvis Costello and Mumford & Sons singing Springsteen's The Ghost of Tom Joad.