Global Citizen throwing star-studded concert in Central Park

NEW YORK (WABC) -- For the third year in a row, Global Citizen is putting on a star-studded concert and festival on the great lawn in Central Park.

Last year, Alicia Keys, Stevie Wonder and John Mayer performed.

This year: No Doubt, Sting, Jay Z, Carrie Underwood, FUN, The Roots and Tiesto will all take the stage.

And they're giving fans a sneak peak on social media.

"It's going to incredible to see tomorrow when there are thousands of people showing how much they care," said Veronica Dominczyk, a supporter.

"It's just something great to see everybody come together like this. The concert is a perfect venue to do it. It's music bringing everybody together, that's what the art was made to do," said Robbie Carpar, a supporter.

The festival's cofounder, Ryan Gall, says more than 60,000 people earned their free admission by doing community service.

"To get a ticket you have to take action. Those actions can be anything from signing a petition or tweeting at a Congressman asking them to vote a certain way or email a world leader asking them to come to the festival come on stage and make an announcement. A commitment on station," said Ryan Gall, the cofounder of Global Citizen.

This year's aim: helping to achieve a world without extreme poverty by 2030. So they're focusing on education, clean water and sanitation, as well as vaccines and immunizations.

"When we work together towards a big goal we can make big change. It's an important movement that everyone who comes will be involved in. It's exciting," Gall said.

For more information and to watch the concert, please visit: globalcitizen.com