Question: Who is the father of the lead vocalist for I Am the Walrus?

full_context: Document 1: I Am the Walrus: ``I Am the Walrus ''is a song by the Beatles released in November 1967. It was featured in the Beatles' television film Magical Mystery Tour in December of that year, as a track on the associated British double EP of the same name and its American counterpart LP, and was the B - side to the number 1 hit single`` Hello, Goodbye''. Since the single and the double EP held at one time in December 1967 the top two slots on the British singles chart, the song had the distinction of being at number 1 and number 2 simultaneously.
Document 2: Evelyn Einstein: Einstein was born in Chicago; after her birth she was adopted by Hans Albert Einstein. Towards the end of her life, she recounted that as a child she was told she was an illegitimate daughter of Albert Einstein and a ballet dancer; however, she had no documentation supporting this claim. She obtained a Master's degree in Medieval literature at University of California, Berkeley. She was married to Grover Krantz for 13 years from 1964 to about 1977. She then worked briefly as an animal control officer, as a cult deprogrammer, and as a Berkeley, California, reserve police officer.
Document 3: While My Guitar Gently Weeps: George Harrison -- double - tracked vocals, backing vocal, acoustic guitar, twelve - string guitar, Hammond organ Paul McCartney -- harmony vocal, piano, bass John Lennon -- electric guitar with tremolo Ringo Starr -- drums, tambourine, castanets Eric Clapton -- lead guitar (uncredited)
Document 4: Don't Pass Me By: Ringo Starr -- vocals, drums, tack piano, sleigh bells, cowbell, maracas, congas Paul McCartney -- grand piano, bass guitar Jack Fallon -- violin
Document 5: The Beatles' rooftop concert: John Lennon -- lead and backing vocals, lead guitar, rhythm guitar Paul McCartney -- lead and backing vocals, bass guitar George Harrison -- backing vocals, lead guitar, rhythm guitar Ringo Starr -- drums Billy Preston -- electric piano
Document 6: I Saw Her Standing There: Paul McCartney -- lead vocals, bass, handclaps John Lennon -- rhythm guitar, harmony vocals, handclaps George Harrison -- lead guitar, handclaps Ringo Starr -- drums, handclaps
Document 7: Mother (John Lennon song): "Mother" is a song by English musician John Lennon, first released on his 1970 album "John Lennon/Plastic Ono Band". An edited version of the song was issued as a single in the United States on Apple Records, on 28 December 1970. The single edit runs 1:41 shorter than the album due to removing the tolling bells that start the song and a quicker fade-out. The B-side features "Why" by Yoko Ono. The song peaked in the United States at number 19 on the "Cashbox" Top 100 and number 43 on the "Billboard" Hot 100.
Document 8: Julia Lennon: Julia Lennon (née Stanley; 12 March 1914 – 15 July 1958) was the mother of English musician John Lennon, who was born during her marriage to Alfred Lennon. After complaints to Liverpool's Social Services by her eldest sister, Mimi Smith (née Stanley), she handed over the care of her son to her sister. She later had one daughter after an affair with a Welsh soldier, but the baby was given up for adoption after pressure from her family. She then had two daughters, Julia and Jackie, with John 'Bobby' Dykins. She never divorced her husband, preferring to live as the common-law wife of Dykins for the rest of her life.
Document 9: Johanna von Trapp: Johanna von Trapp married Ernst Florian Winter on Easter Monday in 1948 and changed her middle name to Franziska. She had seven children: Ernst Leopold (1949–1969), Florian Stefan (1951), Johanna Maria (1952), Notburga Maria (1953), Hemma Maria (1956 ), Agathe (1957 ) and Severin (1959 ). She lived with her family – four daughters and three sons – in both the United States (West Nyack, NY) and Austria (Salzburg, Schloss Eichbuechl N.O.). With Ernst Florian, she raised her children in an organic homesteading tradition incorporating her rich European heritage into family life. She was known for her hosting, cooking and preparing feast day meals that often were shared with upwards of 50 guests. Her indomitable go-to spirit and ability to persevere through the loss of her oldest son from a car accident, showed her strength and resilience. She was known to her children as the story teller of her childhood life in the von Trapp family. Approaching life with a great sense of humor and faith, carried her throughout her life.
Document 10: I Am the Walrus: John Lennon -- lead vocals, electric piano, Mellotron Paul McCartney -- bass guitar, tambourine George Harrison -- electric guitar Ringo Starr -- drums Orchestrated, directed and produced by George Martin Session musicians -- strings, brass, and woodwinds Mike Sammes singers -- backing vocals Ray Thomas -- backing vocals Mike Pinder -- backing vocals Engineered by Geoff Emerick and Ken Scott Mixed by Geoff Emerick and John Lennon
Document 11: Let It Be: The master take was recorded on 31 January 1969, as part of the ``Apple studio performance ''for the project. McCartney played Blüthner piano, Lennon played six - string electric bass (replaced by McCartney's own bass part on the final version at the behest of George Martin), George Harrison and Ringo Starr assumed their conventional roles, on guitar and drums respectively, and Billy Preston contributed on organ. This was one of two performances of`` Let It Be'' that day. The first version, designated take 27 - A, would serve as the basis for all officially released versions of the song. The other version, take 27 - B, was performed as part of the ``live studio performance '', along with`` Two of Us'' and ``The Long and Winding Road ''. This performance, in which Lennon and Harrison harmonised with McCartney's lead vocal and Harrison contributed a subdued guitar solo, can be seen in the film Let It Be.
Document 12: Julia Baird: Julia Baird (née Dykins; born 5 March 1947) is a British retired teacher and author. She is the younger half-sister of English musician John Lennon, and is the eldest daughter of his mother Julia Lennon (12 March 1914 – 15 July 1958) and John 'Bobby' Albert Dykins (1918 – December 1965). She also has an older half-sister, Ingrid Pedersen. Her younger sister is Jacqueline 'Jackie' Dykins (born 26 October 1949).
Document 13: She's Always a Woman: The song was released in 1977, following several other hits from The Stranger including ``Just the Way You Are '',`` Movin 'Out (Anthony's Song)'' and ``Only the Good Die Young ''. Musically, Joel has said that he was influenced by Gordon Lightfoot and his mellow acoustic guitar ballads. It is a love song that Joel wrote for his then wife, Elizabeth Weber. Elizabeth had taken over management of Joel's career, and was able to put his financial affairs in order after Joel had signed some bad deals and contracts. She was a tough and savvy negotiator who could`` wound with her eyes'' or ``steal like a thief '', but would`` never give in''. Because of her tough - as - nails negotiating style, many business adversaries thought she was ``unfeminine, ''but to Joel, she was always a woman. The two eventually divorced in 1982.
Document 14: Julia Murdock Smith: Julia Murdock Smith Dixon Middleton (May 1, 1831 – September 12, 1880) was an early member of the Latter Day Saint movement and the eldest surviving child and only daughter of Joseph Smith and Emma Hale Smith. She was adopted by the Smiths.
Document 15: The Fool on the Hill: Paul McCartney -- vocals, piano, acoustic guitar, recorder, bass, penny whistle John Lennon -- harmonica, Jew's harp George Harrison -- acoustic guitar, harmonica Ringo Starr -- drums, maracas, zill Christopher Taylor -- flute Richard Taylor -- flute Jack Ellory -- flute
ground_truth: Alfred Lennon
sub_queries: who sings lead vocals on i am the walrus Answer: John Lennon
John Lennon >> father Answer: Alfred Lennon