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"): The head of government is the "Taoiseach " (Prime Minister, literally 'Chief', a title not used in English), who is elected by the Dáil and appointed by the President; the Taoiseach in turn appoints other government ministers.
Relevant evidence: Yes