Question: In what year did Susan McFadden join the Celtic studio group also featuring Mairead Carlin and Tara McNeill?

Context articles: Ballydowse
Macho (band)
Celtic Woman: Voices of Angels
Susan McFadden
The Piltdown Men
Celtic Woman: Destiny
Long Play Album
Carnival of Excess: Limited Edition
Ocacia
The Monitors (Australian band)

Ballydowse was a Celtic punk rock band from Chicago, Illinois with a rare mix of anarchist and religious ideas infused into their music.
 Many of the group's members were from the Jesus People USA commune.
 In addition to the group's Mekons/Pogues-style Celtic punk influences, the group also draws from world musics such as klezmer and Tibetan throat singing.
 Ballydowse released two albums both engineered by Steve Albini.
 The debut was entitled "The Land, the Bread, and the People" and was a home place for many who found common cause with certain elements of Christianity while rejecting the American right wing bias so prominent in the church at the time.
 Their second album Fertile Crescent continued this trajectory with a growing Eastern European flavor.
 The group's political activism over the economic sanctions on Iraq in the 2000s, prison reform, death penalty and the short-comings of capitalism was unique among Christian bands of the time.
 The group disbanded in 2003.
Macho was an Italian-American disco/R&B studio group.
 The Guadeloupe born French-Italian businessman Jacques Fred Petrus and Italian musician Mauro Malavasi, formed a joint production company, called Goody Music Production (GMP), in the mid-1970s.
 Their first project, in 1978, was called Macho, featuring Italian Marzio Vincenti as lead singer.
 Their only album was composed of three extended tracks.
 The band's sole chart success in the United States was an almost 18-minute-long disco cover version of the Spencer Davis Group's 1967 hit "I'm a Man", which was written by Steve Winwood.
 The track reached the Top 10 in the "Billboard" magazine's Dance chart in October 1978.
 An edited seven-minute version was also released.
Celtic Woman: Voices of Angels is the eleventh studio album by the group Celtic Woman.
 "Voices of Angels" features vocalists Susan McFadden, Mairead Carlin, Éabha McMahon, and fiddler Tara McNeill, with former member Méav Ní Mhaolchatha as a guest.
 This was Celtic Woman's first album to feature their newest member Tara McNeill.
Susan McFadden (born 8 February 1983) is an actress and singer born in Dublin, Ireland.
 She is best known for playing the roles of Sandy in "Grease" at the Piccadilly Theatre and Elle Woods in "Legally Blonde the Musical" at the Savoy theatre in London's West End.
 She has also been a member of the all female Celtic music group, Celtic Woman, since 2012.
The Piltdown Men were a rock and roll instrumental studio group from Hollywood, California, featuring two lead saxophones.
Celtic Woman: Destiny is the tenth studio album by the group Celtic Woman.
 This is Celtic Woman's first album to feature their newest members Mairead Carlin and Éabha McMahon.
Long Play Album was the first album by the Dutch soundalike studio group Stars on 45, released on the CNR Records label in The Netherlands in 1981.
 In the US the album was retitled Stars On Long Play, released on Atlantic Records' sublabel Radio Records and credited to 'Stars On'.
 In the UK, Ireland, Australia and New Zealand the group was renamed 'Starsound' (on certain releases spelt StarSound or Star Sound) and the album itself was listed as "Stars On 45" or "Stars On 45 - The Album" and released by CBS Records.
 In Spanish-speaking countries both the group and the album were launched under a fourth name: "Estrellas en 45".
 "Stars On 45" was also one of the very few Western pop albums to be officially released in the Soviet Union and large parts of the Eastern Bloc on the state-owned Melodiya label, credited to Stars On 45 but the Russian title of the album translates as "Discothèque Stars".
 In the Philippines, it was released and uses "Stars on 45 Long Play Album" as its title on the label of the LP (Manufactured and printed by Dyna Products, Inc. under license from PhonoGram International B.V., Baarn, the Netherlands, using Mercury label [Violet background, silver foreground]).
Carnival of Excess: Limited Edition is a limited edition reissue of the album "Carnival of Excess", recorded by notorious punk rock musician GG Allin with one-time studio group The Criminal Quartet.
 This release, which contains previously unreleased mixes of the songs from the original album (with one exception, "Outskirts of Life", which used the mix from the original 1996 release), was issued in limited editions of 100 white vinyl albums and 1200 compact discs.
 Added to the original release is a mock-commercial for the album featuring Tiny Tim and excerpts from a phone conversation with Allin about the album.
 Unlike many other GG Allin recordings, this release featured songs in the vein of country music, many of them acoustic.
Ocacia is an international smooth jazz studio and performance group.
 Ocacia is known for their socially conscious lyrics.
 The music is characterized by some as "escapist" in the usage of space, chords and ethnic overtones.
 The chord structure has an absences of "thirds" and is similar to other African Diaspora and African classical music by its “drum and bass” dominance.
 Not all the music fits into the smooth jazz canon, as some of it is more in the film score world.
 Their first album was released in 1999.
 The original members of the group were Owen 'Alik Shahadah (Piano/keyboards), Natasha Odlum-Shahadah (voice), David Hadley (Bass), Brian McCooke (drums).
 In 2002, Natasha Odlum left the group and Nadia Kanouche became the new lead feature vocalist.
 Ocacia works as a studio group composing soundtracks and is also known to work with other artists such as Sona Jobarteh and M.K. Asante, Jr.
The Monitors was an Australian pop band of the early 1980s.
 They were primarily a studio group which involved a collaboration between Mark Moffatt and Terry McCarthy, featuring various vocalists.