In honor of the 45th Earth Day celebration, a bunch of chart-topping pop stars will perform a free concert on the National Mall. You know, for the earth.

On April 18, the Earth Day Network and The Global Poverty Project will host the “Global Citizen Earth Day,” which will feature performances from No Doubt, Usher, Fall Out Boy, Mary J. Blige, Train, and My Morning Jacket. There will also be guest appearances by Common and D’Banj and the whole event will be hosted by will.i.am and Soledad O’Brien.

Though the free event, which will take place on April 18, promises a lot of music, you can also expect equally as much activism. Organizers of the event say this is part of a “widespread effort to mobilize global citizens in the climate and environmental movement and the poverty and development movement, and to drive bold commitments from governments, businesses, and individuals.”

In previous Earth Day celebrations on the National Mall—in 2009 and 2012—activists and advocates spoke about environmental issues in between sets.

“If our world leaders get it right, 2015 can be a historic year of progress for our people and our planet,” Hugh Evans, CEO of The Global Poverty Project, said in a statement. “We have seen significant progress over the last 15 years, and Global Citizen 2015 Earth Day will see thousands of citizens calling on world leaders continue to recognize that the effects of climate change are felt the hardest by the world’s poor.”

You can find more information about the event here.