Rock Choir for more than 200 members in the Wembley Arena and singer for a special gig will be connected 700.
New choir rock, pop gospel, Motown and classical singing and has branches all over the UK.
Members of choirs in Hamilton, Bothwell, Giffnock, Knightswood and Mingavie are to take part.
Wembley at the end of the ceremony as a documentary will be filmed to show on ITV1 later this year gets lost when the rock audience behind a screen will appear. R..
Glasgow members met up with Rock Choir fonder, Caroline Redman Lusher, for rehearsals this week.
Jennifer Sim, a local Rock Choir leader, said: “It is a wonderful opportunity to be able to teach so many people from Glasgow to sing – and we are achieving incredible results.”
Sally Clark, a member of Glasgow City Centre Late Choir, said: “I really enjoy singing in Rock Choir – it has been a great way to meet new friends and have fun singing.
“My mum sings in the Giffnock Rock Choir so we really enjoy sharing the experience. It will be great when all the choirs meet up and we can sing side by side.”