Leo O'Kelly
Leo O'Kelly (born 27 November 1949, Carlow, Co.
 Carlow, Ireland) is an Irish singer-songwriter, multi-instrumentalist, and producer.
 He is mainly known as a member of the Irish folk duet Tír na nÓg.
 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.
 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.
 His third album, "Will", was released in February 2011 and features the poems of John McKenna set to music.
Sonny Condell
Sonny Condell (born 1 July 1949, in Newtownmountkennedy, Ireland) is an Irish singer-songwriter, multi-instrumentalist, and graphic artist.
 He is mainly known as a member of the Irish bands Tír na nÓg and Scullion.
 He released some hits in Ireland as a solo artist like "Down In The City" in 1977 that he covered later with the Belgian singer Micha Marah on her album "Voyage" in 1998.
 For some years, Sonny has got his own solo band called Radar, although he still plays with Tír na nÓg and Scullion.
Tír na nÓg
In Irish mythology and folklore, Tír na nÓg (] ; "Land of the Young") or Tír na hÓige ("Land of Youth") is one of the names for the Otherworld, or perhaps for a part of it.
 It is depicted as a supernatural realm of everlasting youth, beauty, health, abundance and joy.
 Its inhabitants are the Tuatha Dé Danann, the gods of pre-Christian Ireland.
 In the "echtrae" (adventure) and "immram" (voyage) tales, various Irish mythical heroes visit Tír na nÓg after a voyage or an invitation from one of its residents.
 They reach it by entering ancient burial mounds or caves, or by going under water or across the sea.
Live at Sirius
Live at Sirius is a live album by Irish band Tír na nÓg and was released in June 2010, celebrating the duo's 40th birthday.
 It has been recorded during two gigs on August 21, 22, 2009 at the Sirius Art Centre in Cobh.
 They performed tracks taken from their all three studio albums or written during the Tír na nÓg first era, excepting a few ones.
 Two songs are covers from The Rolling Stones and Nick Drake.
A Tear and a Smile (Tír na nÓg album)
A Tear and a Smile is the second album by Irish band Tír na nÓg.
 It was released in the United Kingdom on 7 April 1972 by Chrysalis Records and was the first Tír na nÓg album to be released in the United States, in October 1972.
 The track list is different between the US and the UK releases.
 Because of this, two editions of the album exist but there was no reissue of the North American version.
Tír na nÓg (album)
Tír na nÓg is the first album by Irish band Tír na nÓg.
 It was released in May 1971 in the United Kingdom by Chrysalis Records and distributed by Island Records but was not published in the United States because Leo O'Kelly and Sonny Condell refused to record a cover of Bob Dylan's "Maggie's Farm" for the album, a song they regularly played live.German and Spanish presses of the LP have an Island label although the Chrysalis logo also appears on them.
Scullion (group)
Scullion are an Irish folk rock band that formed in the mid-1970s.
 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.
 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.
 O'Brien Moran left the band in 1980, after the first album.
 Robbie Overson, replacing guitarist Greg Boland, joined the band in 1987.
 Scullion continue to play live.
Tír na nÓg concerts
From 1970 through 1975, then from 1985 through present, Irish folk group Tír na nÓg especially performed concerts in the United Kingdom, either as a support act to bands and solo artists like Jethro Tull, Steeleye Span, Supertramp, Elton John, Hawkwind or as main performers.

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?
Answer: Taoiseach