Underdark
You continue on for perhaps another quarter mile, and there, across a vast, vaulted cavern that you have just entered, you see a band of at least a dozen Dwarves engaged in some activity that looks a lot like they are making camp. Still singing, of course.
The song is in Dwarvish of course, but here's a [rough] translation:
"With a hey and a hi and a ho we go
Marching 'round the glen you know
Shirking not to do the work
Of bopping any straying orc
To send him home with noggin sore
So he shall bother us nae more
With a hey and a hi and a ho we said
We'll find the orcs and bop them dead!"