Those *are* interesting, Brian. Thanks for calling our attention to them.

It isn't surprising that now and again somebody would think to sing while playing the fiddle (or vice versa). It just doesn't seem to have been at all usual.

The first time (and only time for many years) that I heard singer accompanying himself on a fiddle was on an LP reissue of a 78 recording of the song "The Blind Fiddler" (Roud 7833)

Henry Whitter may have been the performer.