Question: When was the British Canterbury scene singer born who worked with David Lloyd Stewart  since 1981? 

Context paragraphs:
Caravan (band): Caravan are an English band from the Canterbury area, founded by former Wilde Flowers members David Sinclair, Richard Sinclair, Pye Hastings and Richard Coughlan in 1968.  The band have never achieved the great commercial success that was widely predicted for them at the beginning of their career, but are nevertheless considered a key part of the Canterbury scene, blending psychedelic rock, jazz and classical influences to create a distinctive progressive rock sound.

Comicoperando: Comicoperando is a musical collective dedicated to the music of Canterbury scene legend, singer and songwriter Robert Wyatt.  The band's debut concert, which world-premiered at the Teatro Communale Luciano Pavarotti in Modena, Italy, in March 2010.  It featured prominent Canterbury scene-affiliated musicians Dagmar Krause (Henry Cow, Slapp Happy, Art Bears), Chris Cutler (Henry Cow, Art Bears, Peter Blegvad Trio) and Richard Sinclair (Caravan, Camel, Hatfield and the North), alongside Wyatt's longtime collaborators Annie Whitehead and Gilad Atzmon, Alex Maguire, Michel Delville, John Edwards and Cristiano Calcagnile.

Live 1990 (Hatfield and the North album): Live 1990 is a 1993 live album released by a reformed line-up of Canterbury scene band Hatfield and the North.  This marked the band's first manifestation since its 1975 break-up.  Original keyboard player Dave Stewart declined to take part and was replaced by French jazz pianist Sophia Domancich, at the time a member of drummer Pip Pyle's band Equip'Out.  This line-up's activity was limited to this one appearance on Central TV's "Bedrock" series.  In addition to a number of tracks from the band's classic repertoire, a large part of the concert was devoted to more recent material.  This was to be Hatfield's swansong until the 2005-06 reformation.

The Battle of Hastings (album): The Battle of Hastings is the 1995 album released by the British Canterbury scene progressive rock band Caravan.

Pye Hastings: Julian Frederick Gordon 'Pye' Hastings (born 21 January 1947 in Tomnavoulin, Banffshire, Scotland) is a British musician.  Born in Scotland and raised in Canterbury, Kent, he is the guitarist and vocalist of the Canterbury scene band Caravan and brother of Jimmy Hastings.

Barbara Gaskin: Barbara Gaskin (born 5 June 1950) is a British Canterbury scene singer.

Caravan (Caravan album): Caravan is the debut album by the British Canterbury scene progressive rock band Caravan.  It was released in January 1969.

Dave Stewart (keyboardist): David Lloyd "Dave" Stewart (born 30 December 1950) is an English keyboardist and composer who has worked with singer Barbara Gaskin since 1981.  He played in the progressive rock bands Uriel, Egg, Khan, Hatfield and the North, National Health, and Bruford.  Stewart is the author of two books on music theory and wrote a music column for "Keyboard" magazine (USA) for 13 years.  He has also composed music for TV, film and radio, much of it for Victor Lewis-Smith's ARTV production company.

National Health: National Health were an English progressive rock band associated with the Canterbury scene.  Founded in 1975, the band featured members of keyboardist Dave Stewart's band Hatfield and the North and Alan Gowen's band Gilgamesh, including guitarists Phil Miller and Phil Lee and bassist Mont Campbell as original members.  The band was named after Stewart's National Health glasses.  Bill Bruford (previously of Yes and King Crimson) was the initial drummer but was soon replaced by Pip Pyle.  Campbell was replaced by Neil Murray and then John Greaves.  Alan Gowen stopped performing with the group after their first album, but returned for their final tours replacing Dave Stewart who resigned after their second album.  Guitarist Phil Miller was National Health's only constant member.

Feels Good to Me: Feels Good to Me is the 1978 debut solo album by the British drummer Bill Bruford.  The band Bruford grew out of the line-up assembled for this album.  Led by drummer Bill Bruford, the album features guitarists Allan Holdsworth and John Goodsall, bassist Jeff Berlin, keyboardist Dave Stewart, and ECM flügelhorn stalwart Kenny Wheeler.  He also enlisted singer and songwriter Annette Peacock.  Musically, the album does not sound like the early Canterbury scene but is more reminiscent of contemporaries Brand X, whose guitarist John Goodsall appears here on the title track.  The album, released in August 1978, is also considered a "vanguard of progressive jazz improvised music".

Supporting paragraphs: Dave Stewart (keyboardist) Barbara Gaskin
Answer: 5 June 1950