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"A Day in the Life"

The last chord of the "Sgt. Pepper" reprise segues amid audience applause to acoustic guitar strumming and the start of what Moore calls "one of the most harrowing songs ever written". " A Day in the Life " consists of four verses by Lennon, a bridge, two aleatoric orchestral crescendos, and an interpolated middle part written and sung by McCartney. The first crescendo serves as a segue between the third verse and the middle part, leading to a bridge known as the "dream sequence". Lennon drew inspiration for the lyrics from a Daily Mail report on potholes in the Lancashire town of Blackburn and an article in the same newspaper relating to the death of Beatles friend and Guinness heir Tara Browne.

According to Martin, Lennon and McCartney were equally responsible for the decision to use an orchestra. Martin said that Lennon requested "a tremendous build-up, from nothing up to something absolutely like the end of the world", while McCartney realised this idea by drawing inspiration from Cage and Stockhausen. Womack describes Starr's performance as "one of his most inventive drum parts on record". The thunderous piano chord that concludes the track and the album was produced by recording Lennon, Starr, McCartney and Evans simultaneously sounding an E major chord on three separate pianos; Martin then augmented the sound with a harmonium.

Riley characterises the song as a "postlude to the Pepper fantasy... that sets all the other songs in perspective", while shattering the illusion of "Pepperland" by introducing the "parallel universe of everyday life". MacDonald describes the track as "a song not of disillusionment with life itself, but of disenchantment with the limits of mundane perception".

As "A Day in the Life" ends, a 15- kilohertz high-frequency tone is heard; it was added at Lennon's suggestion with the intention that it would annoy dogs. This is followed by the sounds of backwards laughter and random gibberish that were pressed into the record's concentric run-out groove, which loops back into itself endlessly on any record player not equipped with an automatic needle return. Lennon can be heard saying, "Been so high", followed by McCartney's response: "Never could be any other way."