My favourite is
The Troll Song by Sam Gamgee:
Troll sat alone on his seat of stone,
And munched and mumbled a bare old bone;
For many a year he had gnawed it near,
For meat was hard to come by.
Done by! Gum by!
In a cave in the hills he dwelt alone,
And meat was hard to come by.
It's an original composition, showing that there is more to Sam than has previously met the eye.
I love listening to Tolkien's singing of it:
http://www.youtube.com/watch?v=gGMFHvxAn4g
That recording is the nearest we're going to get to what Tolkien imagined an 'ordinary' hobbit sounded like when singing.
