Possible drift, or possibly not, given a lead, !Joanna! or Guitar, in any mixed gathering the old popular songs are still sung, possibly because the Words or known. "Tipary (Sic)" "Pack up you Troubles in yer Old Kit Bag", and others that have survived in the peoples memory.And yes I've heard songs such as "Dolly Grey", and "Tipary" sung with gusto at Llanstock and the White Horse Festival.
For what its worth if it is held in memory before the record fades from the charts it becomes Folk !
Gareth