Question: What British Canterbury scene signer was a guest musician on The Civil Surface?

full_context: Document 1: Dusty Springfield: Mary Isobel Catherine Bernadette O'Brien, (16 April 1939 – 2 March 1999), better known as Dusty Springfield, was an English pop singer and record producer whose career extended from the late 1950s to the 1990s. With her distinctive sensual mezzo-soprano sound, she was an important blue-eyed soul singer and at her peak was one of the most successful British female performers, with six top 20 singles on the US "Billboard" Hot 100 and sixteen on the UK Singles Chart from 1963 to 1989. She is a member of the US Rock and Roll and UK Music Halls of Fame. International polls have named Springfield among the best female rock artists of all time. Her image, supported by a peroxide blonde bouffant hairstyle, evening gowns, and heavy make-up, as well as her flamboyant performances made her an icon of the Swinging Sixties.
Document 2: The Civil Surface: The Civil Surface is Egg’s third and final studio album, originally released in 1974 on Caroline Records. The band had broken up in 1972, leaving some of their favourite stage pieces unrecorded. At organist Dave Stewart's suggestion, the trio re-united in order to record these compositions. Among the guest musicians on the album are Steve Hillage (guitar), Lindsay Cooper (oboe & bassoon) and vocalists Amanda Parsons, Ann Rosenthal and Barbara Gaskin.
Document 3: Still Crooked: Still Crooked is the third album by progressive bluegrass group Crooked Still. At the end of 2007 Rushad Eggleston parted ways with the group and was replaced by Tristan Clarridge, cellist of Darol Anger's Republic of Strings. Brittany Haas, 5-string fiddler of the same group, was added to the Crooked Still lineup as well.
Document 4: Barbara Gaskin: Barbara Gaskin (born 5 June 1950) is a British Canterbury scene singer.
Document 5: Canterbury scene: The Canterbury scene (or Canterbury Sound) is a subgenre of, or sibling to, progressive rock. The term describes a loosely defined style of music created by a number of improvisational musicians, some of whom were based in the city of Canterbury, Kent, England during the late 1960s and early 1970s.
Document 6: Beth Gibbons: Beth Gibbons (born 4 January 1965) is an English singer and songwriter. She is the singer and lyricist for the English band Portishead.
Document 7: Cosmic Egg: Cosmic Egg is the second studio album by Australian rock band Wolfmother, released on 23 October 2009. It is the first album by the second lineup of the band, featuring vocalist, songwriter and lead guitarist Andrew Stockdale, bassist and keyboardist Ian Peres, rhythm guitarist Aidan Nemeth and drummer Dave Atkins, formed in 2009 after original members Chris Ross and Myles Heskett left in August 2008. Upon its release, "Cosmic Egg" peaked at number three on the Australian ARIA Albums Chart, the same position as the band's first album. The album was the only studio release by the band to feature Atkins, who left the band in April 2010 during the "Cosmic Egg" promotional tour cycle.
Document 8: Marianne Faithfull: Marianne Evelyn Gabriel Faithfull (born 29 December 1946) is an English singer, songwriter and actress. She achieved popularity in the 1960s with the release of her hit single "As Tears Go By" and became one of the lead female artists during the "British Invasion" in the United States.
Document 9: Saskia Garel: Garel was born in Kingston, Jamaica and immigrated to Toronto, Canada at an early age. With an avid interest in the arts, Saskia graduated from York University with a Bachelor of Fine Arts Honours degree and was awarded the Oscar Peterson Award. During her 4 years at York, she performed in the group Coconut Groove (top 40, Latin and world beat music) and played the Toronto nightclub circuit. It was with Coconut Groove that she was discovered by Richie Mayer and David Bendeth (A&R with BMG Music) and was signed to a record deal as a member of the group Love & Sas. This would launch her music career in a huge way as she went on to garner 2 Juno Awards for best R&B recording for "Call My Name" and "Once in a Lifetime" two years in a row off the same album. Love & Sas toured Canada, the US and the UK, had 3 top ten hits on the Canadian charts and had 5 music videos running in high rotation on Much Music. While shooting her music videos, Saskia was bitten by the acting bug and was able to combine her love of singing and her new found passion for acting in the realm of musical theatre. She garnered the role of Mimi, in the Canadian Production of the Pulitzer Prize winning Broadway show RENT. While on tour with Rent in Vancouver, Canada she landed the part of Jasmine on the TV series Nightman, where she starred as a singer in 10 episodes of their final season. Saskia endured the gruelling schedule of filming during the day and performing as Mimi at night.
Document 10: Bára Basiková: Barbora "Bára" Basiková (born 17 February 1963) is a Czech singer and actress. She was named Female Singer of the Year at the 1991 Anděl Awards. In 2002, she performed the title role in the famous Czech musical, Kleopatra, at Prague's Broadway Theatre. Basiková placed third in the 1987 Zlatý slavík for female singer behind Petra Janů and Iveta Bartošová.
Document 11: KFC Core: KFC Core is the debut album from Tokyo-Brighton based artist DJ Scotch Egg. The album contains 12 tracks of chiptune and breakcore music which was allegedly recorded with a Game Boy, a Loudspeaker, and effects Pedals. The album also includes the song 'KFC Song', a song of Barbershop music which includes The Pipettes and The Go! Team (that also featured as the B-side to The Pipettes' 7" single of 'Judy'). The final song, Scotch Orchestra, is basically a conversation between Shigeru and the staff of the London Road KFC in Brighton, about eating the fast food.
Document 12: Recurring (album): Recurring was the fourth and final Spacemen 3 studio album, finally released (after considerable delay) in February 1991, some time after the band had broken up. By the time the album was recorded, relations between the band had soured to the extent that the record is in 2 parts - the first side by Peter Kember, and the second by Jason Pierce.
Document 13: Eurythmics: Eurythmics were a British music duo consisting of members Annie Lennox and David A. Stewart. Stewart and Lennox were both previously in the band The Tourists (originally known as The Catch), who split up in 1980; Eurythmics were formed that year in London. The duo released their first album, "In the Garden", in 1981 to little fanfare, but went on to achieve global success with their second album "Sweet Dreams (Are Made of This)", released in 1983. The title track was a worldwide hit, topping the charts in various countries including the US. The duo went on to release a string of hit singles and albums before they split up in 1990. By this time Stewart was a sought-after record producer, while Lennox began a solo recording career in 1992 with her debut album "Diva". After almost a decade apart, Eurythmics reunited to record their ninth album, "Peace", released in late 1999. They reunited again in 2005 to release the single "I've Got a Life", as part of a new Eurythmics compilation album, "Ultimate Collection".
Document 14: Blue Weaver: A founder member of Amen Corner and its successor Fair Weather, Weaver replaced Rick Wakeman in Strawbs when he left to join Yes. Weaver was with the Strawbs during their most successful and critically acclaimed period where he played some notable mellotron and other keyboard sequences on their albums "Grave New World" and "Bursting at the Seams". He left Strawbs in 1973, and toured with Mott the Hoople in the US tour. Queen were their support act. He also appeared with the Streetwalkers and session work followed, including work with the Pet Shop Boys. He also played behind the Bee Gees at the initiation of his former Amen Corner colleague drummer Dennis Bryon, who had joined their backing band a year earlier during their successful 1975-79 period, taking in such highlights as "Jive Talkin'", "You Should Be Dancing" and the band's famous contributions on the "Saturday Night Fever" soundtrack. The three-piece backing band of Weaver, Bryon and the perennial Bee Gees sideman, Alan Kendall, played on the Bee Gees' albums, "Main Course", "Children of the World", "Here at Last... Bee Gees... Live" and "Spirits Having Flown". Unusually, Weaver featured as a co-composer on "(Our Love) Don't Throw It All Away", made a hit by the group's younger brother Andy Gibb. Weaver also co-composed the songs for Jimmy Ruffin's 1980 album "Sunrise" with Robin Gibb as lyricist, including the hit single, "Hold On (To My Love)".
Document 15: Barbara Sturgeon: Barbara Sturgeon is a British radio presenter and winner of two Sony Radio Awards for a show she presented on BBC Radio Kent during the 1980s. Sturgeon subsequently presented an early weekend morning programme for BBC Radio 2 in 1992/93, but returned to Radio Kent subsequently, where she presented a lunchtime current affairs show until leaving the station in 2004.
ground_truth: Barbara Gaskin