It's a rock'n'roll thing, so bands will turn what were originally 3/4 songs into 4/4 ("4 on the floor") timing. (Thinking of some versions I've heard of Dougie Maclean's "Caledonia" , and The Corries' version of "Rose of Allendale" which is, IMHO, so much nicer in a gentle 3/4 as e.g. The Watersons sing it.
And also, worth remembering that, whatever the time signature, a slow air is a slow air, and can be played as rubato as you like, and does not need a dominating rhythm to it.