And it turned into a thoughtful party.
Scooter Braun, Grande's manager, introduced the singer by first thanking Manchester, the United Kingdom city's first responders, and the "world class artists who journeyed here on such short notice" to perform at the One Love Manchester benefit concert. The youngest victim was 8.
Found on a Manchester One Love fan website has, so far, been accurate on every act and artist.
"Today's One Love Manchester benefit concert will not only continue, but will do so with greater objective". So obviously, we had a totally different show planned, then we had a rehearsal yesterday and changed everything.
Summer was in the air and the concert had an atmosphere reminiscent of an outdoor music festival.
"We're still singing our songs, our songs, our songs".
"Oh, my God!" could be heard over and over again out the mouths of adoring fans.
Gallagher followed the likes of Coldplay and Ariana Grande at the benefit gig broadcast all around the world.
First of all I just wanna say thank you so much for having me, you guys are so courageous, what an wonderful thing we're doing tonight, would you not agree?
Grande herself took the stage for an emotional set introduced by her manager, Scooter Braun who declared, "Hatred will never win".
Around 50,000 fans were expected to attend - despite some admitting to feeling nervous in the wake of last night's attack in London. You looked fear in the face and said, 'This is Manchester. "The whole world is watching". "Manchester, your bravery is our hope".
Other performers Sunday include Pharrell Williams, Take That and Marcus Mumford.
One of the most powerful moments was when the Parrs Wood High School Choir performed Grande's "My Everything" with the singer.
"Over 10,000 unscrupulous applications", however, were made for free tickets, Ticketmaster said, with people applying despite not having attended the original concert.
Singer Ariana Grande has returned to the stage two weeks after a suicide bombing killed 22 people at her concert in Manchester.
Additional security measures were in place for the concert following Saturday night's marauding van and knife attack in London. While their performances were unforgettable, their words hold just as much power, especially coming 24 hours after the London terrorist attack. "These people aren't going to dampen our spirits", said 34-year-old Abdullah Mala.
The idea for the concert was Grande's, according to Melvin Benn, a music festival organizer. That love of our families and friends will lead us to stand up to evil, fear, and hate.
Grande arrived in Manchester on Friday morning. "It just shouldn't be like this", she told AFP.