We usually do the "Hey Liley" version at our annual Matt McGinn tribute nights: very much in a major key, whereas the Twa Corbies and other derry-down tunes tend to be minor.
So just to confirm that, I'm listening to Pete singing Down-a-Down - yes, very minor, and a totally different tune from the one we sing the "Hey Liley"version to.
Here is the Matt McGinn version:
Two Feet Tall