Although it is a jig, this tune is often played as part of a set to dance The Foula Reel. Aly Bain allegedly commented that the Shetlanders didn’t know the difference between a jig and a reel, but it is also possible they use an older meaning to "reel," namely as a general term for "dance."
Ref: https://thesession.org/tunes/1834
Ref: https://thesession.org/tunes/2203
Ref: https://tunearch.org/wiki/Fields_o%27_Foula_(Da)
: | D | A | D | Bm | |
D | G | A | D | : | |
: | D | DA | GA | AD | |
GA | DA | GA | D | : |