Question: Who is the mother of Antártida's producer?

full_context: Document 1: If You Were Still Around: "If You Were Still Around" is a song by Welsh musician and composer John Cale. It was written by John Cale together with playwright Sam Shepard. It was originally released on Cale's 1982 album "Music for a New Society". On 27 October 2014, a year after the death of his The Velvet Underground–bandmate Lou Reed, Cale released a new version of this song. For this version was also released music video directed by Abigail Portner. At the beginning of the video Cale is lying on the floor in a fetal position and after he views the photos of Reed and other deceased people associated with the Velvet Underground and The Factory: Sterling Morrison, Nico, Andy Warhol, and Edie Sedgwick.
Document 2: Ed Sheeran: Sheeran was born in Halifax, West Yorkshire on 17 February 1991. When he was a child, he moved with his family from Hebden Bridge to Framlingham in Suffolk. He has an older brother named Matthew who works as a composer. Sheeran's parents, John and Imogen, are from London. His paternal grandparents are Irish, and Sheeran has stated that his father is from a "very large" Catholic family. John is an art curator and lecturer, and Imogen is a culture publicist turned jewellery designer. His parents ran Sheeran Lock, an independent art consultancy, from 1990 to 2010.Sheeran sang in a local church choir from the age of four, learned to play the guitar during his time at Rishworth School, and began writing songs while at Thomas Mills High School in Framlingham. He was accepted at the National Youth Theatre in London as a teenager. He successfully auditioned for Youth Music Theatre UK in 2007 and joined their production of Frankenstein in Plymouth. He is a patron of Youth Music Theatre UK (now renamed British Youth Music Theatre) and of Access to Music, where he studied Artist Development. Sheeran is a second cousin of Northern Irish broadcaster Gordon Burns, who hosted the British game show The Krypton Factor.
Document 3: Gwynfor Evans: Gwynfor Evans was born in Barry, near Cardiff, to Dan Evans and Catherine Richard. He had a brother named Alcwyn, and a sister named Ceridwen. His father ran a chain of shops in Barry, and his mother a china shop. His mother was a fluent Welsh speaker. As a boy, he was educated at Gladstone Road School. Later on he was educated at Barry County School, where he was captain of the school's cricket and hockey teams. At the school he began learning the Welsh language, but did not become fully fluent until the age of seventeen.
Document 4: Live at Rockpalast (John Cale album): Live at Rockpalast is a two-disc live album by Welsh musician John Cale. It was released in October 2010 on German record label Made in Germany. It was recorded during his two shows for German music television show Rockpalast on 14 October 1984 at Grugahalle, Essen (first disc; with full band) and 6 March 1983 at Zeche, Bochum (second disc; Cale solo with guitar and piano). This concert is missing "Risé, Sam And Rimsky-Korsakov" (Cale, Shepard) narrated by his then-wife Risé Irushalmi.
Document 5: Hywel Teifi Edwards: Born and raised in Aberarth, Ceredigion, Edwards attended Aberaeron Grammar School and the University College of Wales, Aberystwyth. He taught Welsh at Garw Grammar School, Pontycymmer, where he met his wife Aerona, before becoming an extramural lecturer in Welsh literature at University of Wales, Swansea, and later Professor and Head of the Welsh Department. He and his wife had two children, Huw Edwards and Meinir Edwards now Menir Krishnasamy. He retired from full-time teaching in 1995 but continued to lecture and write books. Edwards was the leading authority on the history of the National Eisteddfod of Wales.
Document 6: Process (John Cale album): Process is the soundtrack album by Welsh multi-instrumentalist and composer John Cale. It was released in August 2005 on French independent label Syntax Records. It was produced, composed and performed by John Cale. It is the original music score for C.S. Leigh's film "Process". It was primarily released on CD and three tracks from album ("Suicide Theme", "Candles" and "Reading Poem") was also released on limited 10" vinyl album.
Document 7: PREMature: The score is composed by South African musician, John Atterbury. The composition involved a process of fusing audio manipulation and live instrumentation, concurrently with tape loops, recordings in the field and programming to present the most organic and contemporary sound possible. This entire process concluded with a music score consisting of 97 tracks for all six episodes of "PREMature", including the final song, "The Start", featuring vocals by London singer/musician, Donna Thompson.
Document 8: Antarctica (band): Antarctica was an American indie rock band from New York existing from 1995 until 1999, generally considered post-rock, shoegazing, or electronica, having been compared with early Cure. Their output consisted of two well-regarded releases, and individual members have been in other bands before and since Antarctica.
Document 9: Roger Waters: Waters was born on 6 September 1943, the younger of two boys, to Mary (née Whyte; 1913–2009) and Eric Fletcher Waters (1914–1944), in Great Bookham, Surrey. His father, the son of a coal miner and Labour Party activist, was a schoolteacher, a devout Christian, and a Communist Party member. In the early years of the Second World War, Waters' father was a conscientious objector who drove an ambulance during the Blitz.
Document 10: Dance Music (album): Dance Music is the soundtrack album by Welsh multi-instrumentalist and composer John Cale. It was released in 1998 on Detour Records label. It was produced by Cale and his then collaborator Jean-Michel Reusser. It is original music score for Ed Wubbe's ballet about Cale's long-time collaborator Nico. Most of the songs was performed by Dutch group Ice Nine (except "Ari Sleepy Too" and "Nibelungen" by Nico and "España" by Cale on piano).
Document 11: 23 Solo Pieces for La Naissance de L'Amour: 23 Solo Pieces for La Naissance de L'Amour is the soundtrack album by Welsh multi-instrumentalist and composer John Cale. It was released in November 1993 on Belgian independent label Les Disques du Crépuscule. It was produced by Cale's then collaborator Jean-Michel Reusser. It is the original music score for Philippe Garrel's film "La Naissance de l'amour".
Document 12: Antártida (album): Antártida is the soundtrack album by Welsh multi-instrumentalist and composer John Cale. It was released in September 1995 on Belgian independent label Les Disques du Crépuscule. It is the original music score for Manuel Huerga's film "Antártida". On this album played several musicians, such as Sterling Morrison and Maureen Tucker from The Velvet Underground or Cale's collaborators Chris Spedding, Erik Sanko and David Soldier. It also featured one song ("Antarctica Starts Here") from Cale's 1973 album "Paris 1919".
Document 13: John Cale: John Davies Cale was born on 9 March 1942 in Garnant in the industrial Amman Valley of Wales to Will Cale, a coal miner, and Margaret Davies, a primary school teacher. Although his father spoke only English, his mother spoke and taught Welsh to Cale, which hindered his relationship with his father, although he began learning English at primary school, at around the age of seven. Cale was molested by two different men during his youth, an Anglican priest who molested him in a church and a music teacher.
Document 14: Kenton Cool: Cool was born in Slough, Berkshire in 1973. His family surname was originally Kuhle and was changed during the Second World War by his half-German grandfather. His father was a photographer and his mother a florist, and the family home was near to Uxbridge, in Middlesex. He was schooled at John Hampden Grammar School in High Wycombe, and later obtained a place at the University of Leeds. Kenton Cool graduated from the University of Leeds in 1994 after studying BSc Geological Sciences.
Document 15: Idwal Robling: Robling was born in Ynyshir in the Rhondda Valley, where he attended the local grammar school. His education was interrupted by the Second World War, and upon being called up was accepted for service in the Royal Navy. However, he was selected by ballot to become a Bevin Boy so instead of going to the Navy he was conscripted to work in the coal mines. After the war, he resumed his education and qualified as a teacher after attending Caerleon College and Loughborough University, although instead of teaching he decided on a different career and became a manager at the Lovell's sweet factory in Newport, Monmouthshire.
ground_truth: Margaret Davies
sub_queries: Antártida >> producer Answer: John Cale
Who is the mother of John Cale ? Answer: Margaret Davies