I still recall with horror a singaround at Cheltenham FF some years ago when a couple "did" Barbara Alan: the female sang a verse with the male accompanying her on the guitar, after which he played a verse of the melody as a guitar solo. They then repeated this for verse 2, and every subsequent verse. By the end I'd just about lost the will to live.

But it certainly added something to the song - about 5 minutes, I reckon.