She later came back to the stage for a moving performance of Somewhere Over The Rainbow, which saw her burst into tears mid-song.
Ariana Grande and Miley Cyrus perform the Crowded House hit in Manchester.
In addition to the 22 individuals killed, 100 people injured when a suicide bomber detonated his device in the foyer of the Manchester Arena at the end of the May 22 concert.
Grande surprised young fans injured in last month's attack with a visit to the Royal Manchester Children's Hospital on Friday.
Ariana and her manager Scooter Braun began planning the One Love gig just days after the attack on her Manchester gig, and her fellow musicians were full of praise for how she handled the tragedy. The One Direction singer was one of the first acts confirmed to be taking part in the concert, and was in complete awe of the crowd and everyone who rallied together to show love.
"I want to take this moment to honour the people that were lost", Bieber can be heard saying.
Take That, who are from Manchester, followed Mumford with fun energy that the crowd danced to.
Warriors beat Cavs to take 2-0 Finals series lead It portends what this series will become if the Cavs can't get more than two guys to play well simultaneously. Durant had 33 points, 13 rebounds , and played fantastic defense on LeBron James for much of the night.
"What an incredible thing we're doing tonight, would you agree", Bieber said.
Richardson says Grande is "very fearless to come back so soon". That's when Cyrus' voice popped over the speakers - from the wrong side of the stage - letting the audience know she was the secret singer in question. "All we feel here tonight is love, resilience, positivity", Williams said.
"I love you so so much".
As of late Sunday morning none of the other performers had tweeted in response to the London attack. The leader of rock band Mumford & Sons sang "Timshel", which includes the lyrics: "But you are not alone in this, and you are not alone in this, as brothers we will stand and we'll hold your hand".
Some fans questioned whether Sunday's show would go on after three men drove a van into a crowd on a London bridge Saturday night before leaping out and stabbing numerous people in nearby bars and restaurants. Proceeds from the concert will go to the Red Cross' We Love Manchester emergency fund.
"As singers you sing all the time, so even when something like this happens you want to express your emotions through song".
The fitting single, which was the best-selling song of 2003, was written by the popular group after the September 11 bombings in NY, and portrays issues surrounding terrorism and discrimination.
Another major initiative to be launched on June 5 is the felling of trees that cause ecological imbalance. People practicing Yoga since morning said "Yoga and environment are the foundations of our body.
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His daugther, Layla Brooklyn Allman , lay a rose on her father's casket during the brief service attended by family and friends. Cher was seen walking alone with her head down after the service as she headed to the private burial.
The world No1 admitted that he was "still muttering a lot" but added: "I don't know how much of an impact it has on my tennis". Andy Murray secures a straight-sets win over Juan Martin Del Potro in a stunning third-round clash at the French Open .
After racing into a 5-1 lead, courtesy of a double break, Makarova closed out the opening set in 33 minutes. Kvitova, 27, bested American Julia Boserup , 6-3, 6-2, to advance to the second round of Roland Garros.
With Luke Ronchi, once an Australia player, thrashing a brisk half-century, New Zealand raced to 117 for one in the 16th over. Australia came out to bat under overcast skies, and Warner was first to depart at 27-1 when he edged behind off Trent Boult .
Further rain interruptions forced the match officials to revise the target to 289 runs off 41 overs according to the DL method. Yuvraj scored a blistering half-century in just 29 balls, while Rohit Sharma (91) remained the top scorer for the Indian side.
Sunday's concert will raise money for victims of the suicide bombing that struck at Grande's show. "We love you, we're with you". The pop prince shared, "I just want to take this time to honor the people that were lost or that were taken".
All we feel here tonight is love, resilience, positivity", said Pharrel Williams, who performed alongside Miley Cyrus . Bravo to EVERYONE involved with "One Love Manchester " - from performers, to fans, to donors, and so many more .
He also moved to end the earlier controversy over his support for police use of "shoot-to-kill" tactics against armed attackers. The Government's emergency Cobra committee gathered on Sunday afternoon, for the second time that day, to discuss the attack.
As I said before, we need to be 100 per cent motivated playing for the country regardless of who you are playing against. In a tournament like this you can't pick and choose and in general, cricketers don't pick and chose.
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