The Big Sing was conceived in 2001, on the occasion of the fortieth anniversary of BBC1’s Songs of Praise. The programme ethos remains the same: congregational and performance items, however on a bigger scale: a larger venue, orchestra, larger choirs, and overall bigger production.
Most of the programmes have been filmed at the Royal Albert Hall, the day after the Last Night of the Proms, as all the production equipment would have already been set up, and it was simply a case of changing the…Source: https://adventist.uk/news/article/go/2019-12-04/413/