As perhaps one of the most laboured choruses of all time, I nominate one of the Village Carols from Dungworth. Overall, the carols are fabulous, but this one brings on a fit of giggles if I'm not careful:

Ho! Ho!
Ho! Ho!
Ho! Ho!
Ho! Ho!,
Ho! Ho! Ho! Ho!

And jingle, jingle, jing-a-jing jing,
Right merry shall you be,
And jingle, jingle, he comes this way,
He comes with the Christmas tree,
And welcome, welcome, welcome Kris,
Right welcome shall you be,
Oh here he is, yes, yes, he is,
'Tis Kris with the Christmas tree,
The Christmas tree,
The Christmas tree,
The Christmas tree, -

The Christmas tree!