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Alicia Keys performs in front of thousands of fans and several world leaders Saturday Sept. 28, 2013 in Central Park in New York. The Global Citizen Festival coincides with the U.N. General Assembly. Fans earned free tickets for helping spread the word or volunteering to help end world poverty. World leaders who attended included Secretary-General Ban Ki-moon and Liberian President Ellen Johnson Sirleaf. (AP Photo/unite4:good, Charles Sykes) ( Global Citizen Festival )

NEW YORK, NY - SEPTEMBER 28: Singer-songwriter Elvis Costello performs at the 2013 Global Citizen Festival in Central Park to end extreme poverty on September 28, 2013 in New York City, New York. (Photo by Stephen Lovekin/Getty Images for Global Citizen Festival) ( 182551059JW00034_2013_Globa )

Stevie Wonder performs at the Global Citizen Festival in Central Park on Saturday, Sept. 28, 2013 in New York. Stevie Wonder gave and electrifying performance at New York's Central Park in front of thousands of fans and several world leaders Saturday, singing his hits and calling for an end to poverty worldwide at the Global Citizen Festival. (AP Photo/unite4:good, Charles Sykes/Invision) ( Global Citizen Festival )

The crowd fills Central Park's Great Lawn at the Global Citizen Festival on Saturday, Sept. 28, 2013 in New York. (AP Photo/unite4:good, Charles Sykes) ( Global Citizen Festival )

NEW YORK, NY - SEPTEMBER 28: Model Erin Heatherton appears on stage at the 2013 Global Citizen Festival in Central Park to end extreme poverty on September 28, 2013 in New York City, New York. (Photo by Stephen Lovekin/Getty Images for Global Citizen Festival) ( 182551059JW00121_2013_Globa )

NEW YORK, NY - SEPTEMBER 28: Larry King and Shawn King pose backstage at the 2013 Global Citizen Festival to end extreme poverty in Central Park on September 28, 2013 in New York City, New York. (Photo by Michael N. Todaro/Getty Images for Global Citizen Festival) ( 182551166ZD00020_2013_Globa )

NEW YORK, NY - SEPTEMBER 28: Bono appears on stage at the 2013 Global Citizen Festival in Central Park to end extreme poverty on September 28, 2013 in New York City, New York. (Photo by Stephen Lovekin/Getty Images for Global Citizen Festival) ( 182551059JW00098_2013_Globa )

NEW YORK, NY - SEPTEMBER 28: Actress Olivia Wilde (L) and Jeffrey Sachs appear at the 2013 Global Citizen Festival in Central Park to end extreme poverty on September 28, 2013 in New York City, New York. (Photo by Stephen Lovekin/Getty Images for Global Citizen Festival) ( 182551059JW00078_2013_Globa )

NEW YORK, NY - SEPTEMBER 28: Actress Katie Holmes poses backstage at the 2013 Global Citizen Festival to end extreme poverty in Central Park on September 28, 2013 in New York City, New York. (Photo by Michael N. Todaro/Getty Images for Global Citizen Festival) ( 182551166ZD00004_2013_Globa )

NEW YORK, NY - SEPTEMBER 28: Will.i.am attends the 2013 Global Citizen Festival to end extreme poverty in Central Park on September 28, 2013 in New York City, New York. (Photo by Michael N. Todaro/Getty Images for Global Citizen Festival) ( 182551166JW00020_2013_Globa )

NEW YORK, NY - SEPTEMBER 28: Singer-songwriter Janelle Monae and Stevie Wonder perform at the 2013 Global Citizen Festival in Central Park to end extreme poverty on September 28, 2013 in New York City, New York. (Photo by Stephen Lovekin/Getty Images for Global Citizen Festival) ( 182551059JW00109_2013_Globa )

NEW YORK, NY - SEPTEMBER 28: Actor Gerard Butler appears on stage at the 2013 Global Citizen Festival in Central Park to end extreme poverty on September 28, 2013 in New York City, New York. (Photo by Stephen Lovekin/Getty Images for Global Citizen Festival) ( 182551059JW00001_2013_Globa )

Bono speaks in front of thousands of fans and several world leaders Saturday Sept. 28, 2013 in Central Park in New York. The Global Citizen Festival coincides with the U.N. General Assembly. Fans earned free tickets for helping spread the word or volunteering to help end world poverty. World leaders who attended included Secretary-General Ban Ki-moon and Liberian President Ellen Johnson Sirleaf. (AP Photo/unite4:good, Charles Sykes) ( Global Citizen Festival )

NEW YORK, NY - SEPTEMBER 28: Bono and Stevie Wonder perform at the 2013 Global Citizen Festival in Central Park to end extreme poverty on September 28, 2013 in New York City, New York. (Photo by Stephen Lovekin/Getty Images for Global Citizen Festival) ( 182551059JW00111_2013_Globa )

INVISION FOR UNITE4:GOOD - Caleb Followill from Kings of Leon performs at the Global Citizen Festival supported by unite4:good and the PVBLIC Foundation in Central Park on Saturday, Sept. 28, 2013 in New York. (Photo by Charles Sykes/Invision for unite4:good/AP Images) ( Unite4:Good Sponsors Global Citizen Festival )

INVISION FOR UNITE4:GOOD - John Mayer performs at the Global Citizen Festival supported by unite4:good and the PVBLIC Foundation in Central Park on Saturday, Sept. 28, 2013 in New York. (Photo by Charles Sykes/Invision for unite4:good/AP Images) ( unite4:good Sponsors Global Citizen Festival )

John Mayer performs at the Global Citizen Festival in Central Park Saturday, Sept. 28, 2013 in front of thousands of fans and several world leaders Saturday, singing his hits and calling for an end to poverty worldwide at the Global Citizen Festival held in New York. (AP Photo/unite4:good, Charles Sykes) ( Global Citizen Festival )