Because they sing "hymns" not "hers"
Two. One to screw in the lightbulb and another to sing about all the good times they had with the lightbulb.
By having Mariah Carey drop the ball! "The audience can sing this one."
Because they sing hymns, not hers!*
Because they sing hymns, not hers.
The same reason they sing Hymns instead of Hers!