End of game spoilers
The words to the Ala Mhigan anthem are:
O come ye wayward brotheres, bereft of hearth and home
Beneath yon burning star there lies a haven for the bold.
Raise up your hands and voices, let fill your hearts with pride,
Above the churning waters we stand strong and unified.
It's about how people fleeing from the Flood (Calamity of Water) followed Rhalgr (the burning star) to a new home. The hymn is quite probably properly the Ala Mhigan anthem, which the Garleans co-opted to tighten their hold on the Ala Mhigans.