Grande performed many of her hit songs. Artists like Justin Bieber, the Black Eyed Peas and Miley Cyrus also performed. Grande said she completely changed the tone of the concert after meeting with the family of 15-year-old Olivia Campbell, one of the victims who died.
"Olivia would've wanted to hear the hits [today,]" Grande told the crowd. "We had a totally different show planed. We changed everything."
Grande performed "Break Free," "One Last Time," and more of her songs, also joining the Black Eyed Peas onstage for their song "Where is the Love?" and singing a duet of "Don't Dream It's Over" with Cyrus.
More than $13 million had been raised by Sunday night for the We Love Manchester Emergency Fund, the British Red Cross told the Associated Press.
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ABC News contributed to this report.