Some of my favorites:

Tom Joad
Pretty Boy Floyd
Gilgarry Mountain
The Wreck of the Edmund Fitzgerald
Broomfield Hill (version by Clam Chowder)
The Queen of Air and Darkness (also by Clam Chowder)
I'm Goin' Back To Where I Come From (Glenn Yarbrough version)
Two Magicians (Steeleye Span version)

Of course, there are lots of others, but these immediately came to mind.

Jay