Pupils from Cherhill Primary School sang out during a concert at the O2 Arena in London yesterday, organised by Young Voices.

The pupils, who have been practicing since September, joined the African Children’s Choir and Britain’s Got Talent finalist Connie Talbot on stage for a performance watched by 12,000 people.

The Young Voices Concert is the largest children’s choir concert organised in the world. Schools are invited to perform at a number of venues across the UK.

This is the third year children from the primary school’s Sing-Up Club have taken part. Yesterday, 39 of them were due to take part in a two-and-a-half hour rehearsal before the concert, finishing at 9.15pm.

All the schools learn the same songs and sing in unison with each other on the night. The band is placed on the stage and the schools are placed below, taking up half the arena.

This year they performed Beatles classic Let It Be, with Connie Talbot, and Sing, the song created by Gary Barlow for the Diamond Jubilee, as well as a mixture of disco, rock and pop medleys.

Children from the school, aged seven to 11, have to audition for the choir as it is so popular, and they rehearse every Wednesday evening after classes.

For the past three years, they have won the prize for the best primary school choir at the Wootton Bassett Arts Festival.

Deputy head teacher Helen Williams, who leads the choir, said the children had practiced every lunchtime for the past couple of weeks before the concert.

She said: “This is a big highlight for us in the school year. We got the songs in September and we’ve spent the last couple of months drumming it into them.

“They are so excited, one little boy has been on countdown for the last two months.

“The children in Years 4, 5 and 6 have been already, but it will be the first time for the seven to eight-year-olds.

“You never forget their faces when they walk into the arena and see the size of it. I’m very proud, they all work so hard and they’re all really dedicated. It’s like a community – the children who are seven mix with the children who are 11.”