Question:  Tír na nÓg are an Irish folk band formed in 1969 in a sovereign state in north-western Europe whose head of government is the what?
Sentence (from "Republic of Ireland"): Ireland ( ; Irish: "Éire" ] ), also known as the Republic of Ireland ("Poblacht na hÉireann "), is a sovereign state in north-western Europe occupying 26 of 32 counties of the island of Ireland.
Relevant evidence: Yes