It is a great song by a great and prolific writer. I've heard many versions but it's been a few months and I don't recall harp in any of them. This one was my favorite songs of his and when it popped up I set my instruments aside and listened.
I learned to play along with "I remember the day, that Clayton Delaney died". Another great song.
Despite what Buddy Rich said, there is much gold in country tho I found that most artists get repetitious.