"Tonight, I'm taking a knee for America... Both knees in prayer for our planet, our future, our leaders of the world and our globe," singer says
Brandi Carlile, Valerie Simpson, Paul Shaffer help belt "Power to the People" at Global Citizen Live concert
Usher, Hugh Jackman, Forest Whitaker also praise socially conscious festival in 'Louder Together'
The Killers, Chainsmokers, Big Sean, Pharrell Williams, Alessia Cara and more to perform at annual Central Park event
"By 2030, 800 million – that's half of the young people of the world – will drop out of school," Shakira warns at Hamburg, Germany fest
Demi Lovato, Indian musicians, Bollywood celebrities will join concert benefiting Miracle Foundation
Singers perform Crowded House's "Don't Dream It's Over," Pearl Jam's "Nothingman" and Patti Smith's "People Have the Power" at Central Park
Free festival to drive actions for Global Fund's efforts to end AIDS, tuberculosis, malaria
Usher, Selena Gomez, Eddie Vedder, Chris Martin, Yusuf/Cat Stevens and many more also set to perform at fifth annual awareness-raising concert
Singer-songwriter caps magical year with headlining appearance at 2015 Global Citizen Festival
Poverty-eradicating Central Park show draws an estimated 60,000 people
All-star collaboration featuring fan-submitted lyrics will raise awareness for extreme poverty
Global Festival curator Chris Martin also appears during Ed Sheeran's set to sing "Thinking Out Loud"
Global Citizen Festival also features Pearl Jam covering John Lennon, Beyoncé singing "Drunk in Love" with Ed Sheeran
Beyoncé, Pearl Jam and more battle poverty in Central Park this weekend