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?

<P0-S0> Scullion are an Irish folk rock band that formed in the mid-1970s. <P0-S1>  They were quite popular in Ireland, and released several LPs, and two CDs – the compilation "Ghosts And Heroes" on the Kitten label in 1992 and another compilation "Eyelids into Snow – A Collection" in 2001. <P0-S2>  The founding members were Sonny Condell (also a member of another popular Irish music band Tír na nÓg), Philip King, Greg Boland and Jimmy O'Brien Moran. <P0-S3>  O'Brien Moran left the band in 1980, after the first album. <P0-S4>  Robbie Overson, replacing guitarist Greg Boland, joined the band in 1987. <P0-S5>  Scullion continue to play live. <SEP> <P1-S0> Leo O'Kelly (born 27 November 1949, Carlow, Co. <P1-S1>  Carlow, Ireland) is an Irish singer-songwriter, multi-instrumentalist, and producer. <P1-S2>  He is mainly known as a member of the Irish folk duet Tír na nÓg. <P1-S3>  After the band broke up, he produced albums on Polydor and EMI labels for other Irish artists like "Restless Night (Ray Dolan album)" in 1975 by Ray Dolan who wrote "Hey Friend" on the first Tír na nÓg LP. <P1-S4>  In 2000, Leo released his first solo album called "Glare", then "Proto" in 2003 which consists in a collection of songs that he recorded between 1975 and 2001 whose one is a cover with Mark Gilligan of Nick Drake's "Northern Sky" and another is a vocal improvisation by his son, Aaron O'Kelly, at the age of 1. <P1-S5>  His third album, "Will", was released in February 2011 and features the poems of John McKenna set to music. <SEP> <P2-S0> 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. <P2-S1>  The capital and largest city is Dublin, which is located on the eastern part of the island, and whose metropolitan area is home to around a third of the country's 4.75 million inhabitants. <P2-S2>  The state shares its only land border with Northern Ireland, a part of the United Kingdom. <P2-S3>  It is otherwise surrounded by the Atlantic Ocean, with the Celtic Sea to the south, Saint George's Channel to the south-east, and the Irish Sea to the east. <P2-S4>  It is a unitary, parliamentary republic. <P2-S5>  The legislature, the "Oireachtas ", consists of a lower house, "Dáil Éireann ", an upper house, "Seanad Éireann ", and an elected President ("Uachtarán ") who serves as the largely ceremonial head of state, but with some important powers and duties. <P2-S6>  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. <SEP> <P3-S0> Tír na nÓg are an Irish folk band formed in Dublin, Ireland, in 1969 by Leo O'Kelly and Sonny Condell. <P3-S1>  They are often considered as one of the first progressive folk bands with other artists like Nick Drake or groups like Pentangle. <P3-S2>  Their music mainly consists of their own compositions, based on strong Celtic roots and typically featuring intricate acoustic guitar playing and close harmony singing. <P3-S3>  In their early years, they toured the folk clubs of the United Kingdom or internationally as a support act for several rock bands. <P3-S4>  Today, they regularly give concerts, especially in Ireland.