The Hobbit, “Flies and Spiders”. The thirteen dwarves were captured and tied up in Mirwood by giant spiders. Bilbo was invisible, as he was wearing the ring, and he lured the spiders away from their captives by provoking them with his bodiless singing.

Old fat spider spinning in a tree!
Old fat spider can’t see me!
Attercop! Attercop!
Won’t you stop,
Stop your spinning and look for me?

Old Tomnoddy, all big body,
Old Tomnoddy can’t spy me!
Attercop! Attercop!
Down you drop!
You’ll never catch me up your tree!

Lazy Lob and crazy Cob
are weaving webs to wind me,
I am far more sweet than other meat,
but still they cannot find me!

Here am I, naughty little fly;
you are fat and lazy.
You cannot trap me, though you try,
in your cobwebs crazy.

Provided by: Ainulindale