Ariana Grande critic Piers Morgan apologizes to singer

Proceeds from the single, and the concert go towards the We Love Manchester victims' fund, set up by officials at Manchester City Council and the British Red Cross. He sang and offered encouraging words to the crowd, who held inspirational signs in their hands.

But Grande saved the most emotional moment for last when she did a cover of "Somewhere Over the Rainbow", in which she sang through tears.

The 38-year-old singer's name was announced in the original lineup for the concert on Sunday, and though he sent in a video message of support that was broadcast during the telecast, some fans were left wondering why he didn't perform.

Cosmopolitan reported Monday that it was the first time the artist had incorporated the song into one of her stage shows.

Speaking after laying flowers on Borough High Street, Ms Campbell said she had felt "sick" when she learned about Saturday's attack. One Love Manchester is raising money for those affected by the bombing at the end of Ariana Grande's concert in Manchester on May 22, 2017.

But alongside the star's many duets was one with American singer and songwriter Victoria Monet, but who is the performer?

Pharrell Williams and Miley Cyrus brought the energy when they performed Happy.

Robbie Williams also performed, changing some of his lyrics of "Strong" to honor the Manchester victims.

She told the audience, "Manchester, we're gonna be all right". Authorities have said the attack started with a van plowing into pedestrians and then involved three men using large knives to attack people in bars and restaurants at a nearby market.

Although the sight of people enjoying themselves at One Love Manchester was a welcome one after the recent terror attack on the city, thoughts of the 22 that lost their lives that night were never far away.