Something as gaelige, Marie...

Go through any early Clannad or The Bothy Band's material. They all have their merits.

Two personal favourites are An Coinleach Glas an Fhomhair and Cásadh an tSúgain.... the latter being a song that has never failed to leave me in a crumpled heap of emotion by the time the last verse comes around... It is very close to me, that one...

Either way, choose a song that you can identify with.
... and have fun!!

B.