The song "sally ann" is whats called a "calling" song--
Sally ann's husband was hung on a tree on their wedding day.
She mourns for him still. She went a little crazy still looking for him, but she promised to love him till the day she died-And she meant it/(not like this throw-away world/people nowadays)i guess that drove her crazy?
They are saying in the song, that if you listen to the fiddlers tune if he "calls" it right, the spirits of sally ann & her hubby will be there dancing & you can feel them/there's something magic about about a happy wedding & then tragedy the same day/don't know what it is? A "caller" doesn't have to be able to sing/he just "calls" out the words to the song!!
(he also "calls" the spirits to dance/and not the drinking kind)
To tell you about "calling" here in appalachians would take another paragraph.....