Question: Who sings the opening vocals on "Hey Jude?"
About the article "Hey Jude", section "Composition and structure".

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Jude, a young shipyard worker from Liverpool, enlists in the Merchant Navy and jumps ship in New Jersey hoping to find his American G.I.
father, whom he has never met ("Girl", "Helter Skelter", "Hold Me Tight", "All My Loving").
Meanwhile, Lucy Carrigan worries about her boyfriend Daniel who is headed for service in the Vietnam War, while in Dayton, Ohio, Prudence pines for a fellow female cheerleader ("I Want to Hold Your Hand").
Jude meets his father, who is a janitor at Princeton University, and befriends Lucy's brother, the privileged and rebellious student Max ("With a Little Help from My Friends").
Lucy receives a letter from Daniel ("It Won't Be Long"), but when Max brings Jude home with him for Thanksgiving Jude becomes attracted to Lucy ("I've Just Seen a Face").
Max drops out of school and he and Jude move into a bohemian enclave in Greenwich Village, living with aspiring singer Sadie (Dana Fuchs).
Meanwhile, after his younger brother is killed in the 1967 Detroit riot ("Let It Be"), Jojo is seen leaving home and arriving by bus in New York City ("Come Together").
While Jojo auditions for Sadie's band, Max becomes a taxi driver and Jude finds work as a freelance artist.
They are soon joined by Prudence, who has hitchhiked to New York and left an abusive boyfriend.
When Daniel is killed in Vietnam, Lucy decides to visit Max in New York before starting college ("Why Don't We Do It in the Road?
She and Jude fall in love ("If I Fell"), while Max is drafted into the army ("I Want You (She's So Heavy)").
Prudence is attracted to Sadie, and becomes depressed when Sadie and Jojo begin a relationship.
Prudence locks herself in a closet and has to be coaxed out of the closet (literally and figuratively) by her friends ("Dear Prudence"), then disappears after wandering off during a peace rally at which Paco, the leader of the Students for a Democratic Republic (SDR), is a speaker.
At a book function for existential drug guru Doctor Robert, Jude, Lucy, Jojo, Sadie and Max drink punch laced with LSD.
They embark with Doctor Robert on his "Beyond" bus ("I Am the Walrus"), end up stranded outside the compound of psychonaut, and see Mr. Kite's bizarre circus where they are reunited with Prudence, who performs as Henry the Horse ("Being for the Benefit of Mr. Kite!
", "Because").
Back in New York, Sadie reluctantly agrees to her manager's demand that she drop her backing band, leading to a bitter breakup and musical split between herself and Jojo ("Oh!
Darling").
Max is deployed to Vietnam, leading Lucy to become increasingly involved in the anti-war movement, especially with the SDR.
Jude remains comparatively apolitical but devoted to Lucy ("Something").
Jude dislikes the increasing amount of time that Lucy spends with the SDR and suspects that Paco is attempting to seduce Lucy, and this puts a strain on their relationship and affects Jude's art ("Strawberry Fields Forever").
Finally, Jude storms into the SDR office and points out the hypocrisy of the group's actions ("Revolution"), leading to an argument with Lucy in which she leaves him ("While My Guitar Gently Weeps").
Jude follows Lucy to an anti-war demonstration at Columbia University ("Across the Universe") but when the police start arresting the protestors (including Lucy and Paco), Jude tries to help Lucy but is beaten by police and arrested ("Helter Skelter").
Having been in the United States illegally and unable to legally prove that he is the son of an American citizen, Jude is deported back to England, where he returns to his old job at the Liverpool shipyards ("A Day in the Life (instrumental)").
This is also revealed to be the time frame of the opening scene.
Jojo continues his music, playing solo guitar in bars, while on tour (although her career is skyrocketing) Sadie drowns her sorrow and loneliness in alcohol.
Max is wounded in Vietnam and sent home, psychologically scarred and dependent on morphine ("Happiness Is a Warm Gun").
Lucy continues her activities with the SDR, but finds herself caught up as Paco leads the movement deeper and deeper into violence.
She finally leaves when she discovers that Paco is making bombs, but is surrounded by constant reminders of Jude and what they had shared ("Blackbird").
One of Paco's homemade bombs explodes, killing him and his confederates and destroying the SDR offices; on reading this news in the local newspaper, Jude thinks that Lucy is dead, but upon learning from Max that she is alive, he arranges to return to New York legally ("Hey Jude").
Jojo and Sadie, who have reconciled, put on a rooftop concert, with Prudence as a member of their band ("Don't Let Me Down").
Max brings Jude to the rooftop, but the police arrive to break up the concert and Lucy down on the street cannot get through the barricade.
Jude manages to remain on the roof and sings "All You Need Is Love", and the police allow the band to accompany him.
Max draws Jude's attention to an opposite rooftop where Lucy is standing and looking at him.
Lucy and Jude gaze smilingly at each other across opposite rooftops as the performance concludes ("Lucy in the Sky with Diamonds"). 
"Hey Jude" begins with McCartney singing lead vocals and playing the piano.
The patterns McCartney plays are based on three chords: F, C, and B-flat (I, V and IV); the second verse adds accompaniment by guitar and a single tambourine.
The main chord progression is "flipped on its head" for the coda since the C chord is replaced by E-flat.
Author Tim Riley notes, "As Ringo offers a restrained tom-tom and cymbal fill, the piano shifts downward to add a flat seventh to the tonic chord, making the downbeat of the bridge the point of arrival ('And any time you feel the "pain"')."
At the end of each bridge, McCartney sings a brief phrase ("Na-na-na na ...") and plays a piano fill which leads to the next verse; the phrase McCartney sings serves to "reorient the harmony for the verse as the piano figure turns upside down into a vocal aside."
Additional details, such as tambourine on the third verse and subtle harmonies that accompany the lead vocal, are added to sustain the interest of the listener throughout the four-verse, two-bridge song.
The verse-bridge structure of the song persists for approximately three minutes, after which the band leads into a four-minute-long coda.
During the coda, the rest of the band, backed by an orchestra that also provides backing vocals, repeats the phrase "Na-na-na na" followed by the words "hey Jude" until the song gradually fades out.
"Time" magazine described the coda as "a fadeout that engagingly spoofs the fadeout as a gimmick for ending pop records."
Riley notes the repeated chord progression of the coda (I-VII-IV-I) "answers all the musical questions raised at the beginnings and ends of bridges," for "The flat seventh that pose dominant turns into bridges now has an entire chord built on it."
This three-chord refrain allows McCartney "a bedding ... to leap about on vocally", so he ad-libs his vocal performance for the rest of the song.
Riley concludes that the song "becomes a tour of Paul's vocal range: from the graceful inviting tones of the opening verse, through the mounting excitement of the song itself, to the surging raves of the coda."
Filming for promotional clips of "Hey Jude" and "Revolution" took place on 4 September 1968 under the direction of Michael Lindsay-Hogg.
Two finished clips of "Revolution" were produced, with only lighting differences and other minor variations.
The Beatles sang the vocals live over the pre-recorded instrumental track from the single version.
Their vocals included elements from "Revolution 1": McCartney and Harrison sang the "shoo-bee-doo-wah" backing vocals, and Lennon sang "count me out, in".
Lennon also substituted "we'd all love" for "we all want" in the opening verse.
Later it was correctly pointed out that a track of Lennon's voice is in fact playing in the background during the performance and can be heard quite noticeably at the end of the song when he fails to shout out his last and most explosive 'All right.'
Instead, the shout is heard from the soundtrack after he has already stopped singing and backed away from the microphone.
While the "Hey Jude" clip debuted on David Frost's ITV television programme, the "Revolution" clip was first broadcast on the BBC1 programme "Top of the Pops" on 19 September 1968.
The first US screening of "Revolution" was on the 13 October 1968 broadcast of "The Smothers Brothers Comedy Hour". 
Paul McCartney sang the song in the closing moments of the opening ceremony of the 2012 Summer Olympics hosted in London.
On 4 August 2012, McCartney led the crowd in a rendition of the song while watching cycling at the velodrome.
It is played at Olympia at half-time during home games of Swedish football team Helsingborgs IF.
The coda part of the song is being used as a football chant for Arsenal striker Olivier Giroud by Arsenal fans, with the word "Giroud" replacing "Hey Jude".
Brentford FC fans have sung "Hey Jude" for years as one of their home anthems. 
"Broadcast during the weekend of May 29, 1995."
Intro - Jingle  Ain't That A Shame - Outtake  Intro / I'm In Love Again - Fats Domino, Paul sings along  Back In The U.S.S.R. - Studio outtake, probably from 1989  Intro / Ain't She Sweet - Jonathhan & Darlene Edwards  Lovers That Never Were - Paul and Elvis Costello.
Partial demo / regular  This Sad Bureque - Elvis Costello & The Brodsky Quartet  Be Bop A Lula - Soundcheck in Kansas City  Intro / The Joker - Steve Miller Band  Hey Jude - Rehearsal, mock version  Linda's Recipe / Sugertime - Linda sings lead and Paul backing vocals  Intro / Spies Like Us - Demo version  Let 'Em In - Reggae version by Shinehead  Can't Buy Me Love - Soundcheck