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 "Tír na nÓg (band)"): Tír na nÓg are an Irish folk band formed in Dublin, Ireland, in 1969 by Leo O'Kelly and Sonny Condell.
Relevant evidence: Yes