I came to this song by way of the PBS series "Liberty! The American Revolution." I was hoping for more when I looked up the James Taylor album. However this pretty much stands alone. Mark O'Connor is the violin artist here so it makes for a perfect combination.
The original song is "Shule Aroon" or Siulil a run (Walk my Love) an Irish folksong. It was changed to what we hear today and I will ever tie this song to the Revolution.