You can bet the seasonal favourite was on the bill when this choir performed at Glasgow Cathedral in 1947.
Take a close look at their uniforms. The men were German POWs who, two years after the end of the war, were still stuck in Blighty and yet to make it home to their families.
As reparation for starting the Second World War, such men were formed into work gangs and put to labour across the UK.
Much of the infrastructure of the post-war Pollok housing estate was built by German POW gangs.
When not at work, the men formed clubs and societies to boost their moral. Choral singing was one way to remind them of home.