Really nicely written! And...even though creatures is plural, the verbs sing and dance aren't.
I mean...its just like saying
cups breaks...or
cows moos

That is weird, I thought I already reviewed this one!
(Creatures is plural; wouldn't the verbs used with it be; sing and dance?)
As I already stated in my first review:
Dark subject, well chosen sentences with good words (I don't think these are words too difficult to understand!)
I think it is just well written, and good poem with a darker theme...
So please, write some more!