"we still have the Collector album of Robin Hall accompanying Jeannie Robertson singing My Son David - oh dear!!"
.,,./
Not sure this entirely relevant here, Jim. IIRC, Jeannie Robertson & Robin Hall were together in the Collector studio in Greenford to make this. He played as she sang, and Colin Pomroy [I think it was -- or perhaps Paul Carter?] recorded the performance. I don't think the accompaniment was dubbed on, but that it was made like this with Jeannie's consent and co-operation. You might not like the accompaniment or think it suitable to Jeannie's singing; but I am sure there was none of the post-hoc interference as related on this thread. So perhaps not really a comparable instance?

~M~