Remember the amazing reaction to Sunday Bloody Sunday on the 360 tour? Every night it went out in support of the Green Movement that sprang from the 2009/10 Iran elections. The response from across the world - including in Iran - was phenomenal.
As the 2013 elections approached, the band were asked by Iranian human rights activists to contribute their music again. As Bono says, at the beginning of the performance, 'Greetings from New York City to the good people of Iran...'