The group linked up with the International Space Station to speak with French ESA astronaut Thomas Pesquet about life in space.
All of the musicians will film themselves from homes with their cellphones or other equipment.
Activists say international music tours heavily impact the environment, with concerns about the amount of electricity used to power stadiums.
Ariana Grande will lead the "One Love Manchester" concert almost two weeks after her concert in the city was hit by a suicide bombing that killed 22 people and wounded 116. But there are concerns that survivors may miss out on free tickets.
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