Here are copies of the folk songs and ballads recovered in the "Antiquarian Revival" of the 18th century (and after, during the Romantic period):
And below are youtube links to a variety of different 20th century groups performing them. Some aversions seek to be faithful to the originals, and some (in the tradition of folk music itself) take liberties.
"Twa Corbies," performed by Steeleye Span
"Tam Lin" performed by Fairport Convention
"Matty Groves" performed by Fairport Convention
"Bedlam Boys" performed by Steeleye Span
"Twa Corbies," performed by Steeleye Span
"Tam Lin" performed by Fairport Convention
"Matty Groves" performed by Fairport Convention
"Bedlam Boys" performed by Steeleye Span