The Ballad of Urg.

[Urg of the Hills]

Oh, those hills
Those wond'rous hills
Rolling and dipping and mountainous hills
Hills filled with groves and green blades of grass
And one obscene ogre with a big, hairy ass.
Who flatulates in the wind and picks at his nose
And who belches and burps and sucks on his toes
An Ogre named Urg who lives for cheap thrills
In those majestic, rolling green hills.

[Ashin Arinathe]

While travelling across the dimensional planes, Ashin Arinathe fell from his doorway as he passed from world to world. It had been a simple mistake, really. Some horrifying sound from this world caused his muscles to tense as he passed through, and he fell from his channeled doorway to the hard grass of the hill. As it turned out, the "horrifying sound" had been nothing more than the Ballad of Urg.

Hearing the horrible song sung by the monster, Ashin Arinathe fired his pistol several times as the huge beast, hoping to at least shut it up if he could not kill it.