This podcast gives a brief history of the song, performance of it with voice and Appalachian dulcimer, and links to a variety of resources.  
*Note:  While I have arranged in DAD for the key of G, you can use a version by Zuckerman or Smith and place the capo on the 3rd fret to be in the key of G.
 
LINKS
My arrangement for Appalachian Dulcimer:  Barbara Allen in G DAD using Grand Staff.pdf
Blog with additional information:  https://blogs.loc.gov/folklife/2017/02/song-of-the-week-barbara-allen/
Vocal versions:
Farya Faraji
Legendary Folk Songs
Nina Ricci
University of Arkansas Digital Collections (recorded in 1960)
Library of Congress (recorded 1938)
Dulcimer Tab Available Online:
Ron Zuckerman (DAD)
Steve Smith (DAD)
 
 

This podcast introduces the series and the host.  Tells what the future formats will be.   Barbara Allen will be the first in the series.