Amanda Holden and Motsi Mabuse form part of a celebrity coaching line-up that will mentor a new choir ahead of their performance in front of the King and Queen Consort at the Coronation Concert next month.
A BBC programme will explore how the 300 singers were brought together from diverse backgrounds to perform at the event at Windsor Castle in May.
Mentoring the singers in the one-off documentary Sing For The King: The Search For The Coronation Choir will be choirmaster Gareth Malone, Strictly Come Dancing judge Mabuse, Britain’s Got Talent judge Holden and actress Rose Ayling-Ellis.
The Coronation Choir’s final group includes among others an all-deaf sign performance organisation, a traditional male voice choir from Caerphilly, Wales, Yorkshire’s only female South Asian choir, the London Fire Brigade and a troupe of RNLI sea shanty singers from Portishead, Somerset.
The event takes place the day after Charles and Camilla are crowned at Westminster Abbey.
Other royal celebration programming by the corporation includes Stitching For Britain, in which The Great British Sewing Bee judge Patrick Grant looks at how manufacturers Kashket & Partners are providing parade uniforms for the coronation.
Charlotte Moore, chief content officer at the BBC, said: “The coronation is a once-in-a-generation opportunity to mark history with an unparalleled breadth of programmes.
“We will have something to enthral all audiences, from the pageantry to the procession and the concert, and bring everyone together to celebrate and to share in the significance of the occasion.”
Sing For The King: The Search For The Coronation Choir will be on BBC One at 8pm on Friday May 5.