They are mandolin tabs, kat..., but it's not too complez a song
3 chord trick, in a way...

If you're in 'G'

Chorus:
G - Em
G - Em - D
D - G

Verse:
G - C - D
D - G
D - G

... ok..., a four chord trick...

The late Mr. John B. Keane, from Listowel C. Kerry wrote this,to the best of my recollection.

B.