Among those performing are the Manchester Survivors Choir, a group made up of people who were at the arena on the night of the fateful concert, and Parrs Wood High School's Harmony Group, whose post-attack tribute went viral past year.
The atrocity was one of a spate of terrorist attacks to hit Britain past year - the one in Manchester and four in London - that included bombings and deadly violence with vehicles and knives.
Grande later went on to hold a huge charity concert, One Love Manchester, which raised millions to help the victims of the attack and their families.
Opposition leader and head of the Labour Party Jeremy Corbyn (l.) also attended the memorial service, sitting two seats down from Prime Minister Theresa May.
Members of the public watched proceedings on a big screen in nearby Cathedral Gardens, while the service was also screened at York Minster, Liverpool Metropolitan Cathedral and Glasgow Cathedral.
A total of 22 people were killed and more than 800 others were either physically or psychologically injured. "The country stood strong, especially Manchester". On Tuesday, People magazine reported she had begun what it called a "casual" relationship with "Saturday Night Live" cast member Pete Davidson, 24, whom she has known since appearing as both host and musical guest on the March 12, 2016, show.
Responders and survivors recall the attack in disturbingly vivid terms: the orange glow and rolling flames; the rattling machine-gun sound of shrapnel; the flesh and blood of 22 killed and more than 100 wounded that "people shouldn't see".
Ariana Grande has sent "light and warmth" to the victims of the Manchester terrorist attack.
Well-wishers have also been encouraged to share messages of tribute, solidarity and love, and hang them on the Trees of Hope trail throughout the city, the Manchester Evening News reported.
"Thank you for being so strong, I'm so proud of you", one more user said.
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Great Northern, Southern and Thameslink trains cancelled and delayed
More than four million trains across Britain have been rescheduled, in changes created to allow 400 extra trains to run each day. In most cases, they will be positive changes; but in some areas things will be different and the times may have changed.
Julie, from Eccles, who came with her son Louis, said they wanted "to pay our respects as it just touched everybody".
Later Tuesday, more than 3,000 singers from local choirs will come together to mark the anniversary in Albert Square.
Rashford, from Wythenshawe in the south of the city, wrote on United's website of his memories of growing up in Manchester and what it means to him.
Ariana Grande is still deeply affected by the Manchester bombing.
Salman Abedi, a British man of Libyan heritage, blew himself up outside the venue, in the northern English city, and an investigation continues into how the attack happened.
Boutique assistant Kelly Haslam, 22, said: "We all feel this is where we need to be".
He wrote: "Remembering the Manchester attack and sending love to their families". One transport-police officer, who rushed in from the adjacent Manchester Victoria train station, recalls trying to calm a girl whose mother had died. Five attacks, including the Manchester bombing and others in London, had got through, four related to Islamist terrorism.
The sing-along saw performances from 10 singing groups, including the Manchester Survivors Choir, who sang a tearful version of Andra Day's Rise Up to rapturous applause, and the Parrs Wood High School Harmony Group.
A memorial service is being held at Manchester Cathedral on Tuesday and a minute's silence held across the United Kingdom to honour the victims.
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