Because they sing hymns, not hers!*
Because they can't compete with an invisible power that actually exists
He was looking for a porpoise. (thought this one up but I doubt I was the first one that did.)
Sum sing wong
Because she uses the other one to sing.
Because they sing hymns, not hers.
Because they sing "hymns" not "hers"
A: The same reason they sing Hymns instead of Hers!