"Drever, returned to sing Farewell to Stromness – collected by the Orkney Song Project, even though it includes the line "The mountains and valleys of Orkney farewell," suggesting it does not originate from there, joked Drever – before the polkas ended the session."

from

http://www.shetlandtimes.co.uk/2013/05/05/roaring-crowd-revels-in-the-isles-gathering