Short answers, pulled from the story.
"In My Life" is credited to the Lennon-McCartney songwriting partnership, but its authorship is disputed. John Lennon wrote the lyrics and claimed McCartney's contribution was limited to the harmony and middle-eight; McCartney said he composed the melody from beginning to end, inspired by Smokey Robinson and the Miracles.
"In My Life" was released on the Beatles' 1965 studio album Rubber Soul.
George Martin recorded the piano solo on the 22nd of October 1965 with the tape running at half speed. When played back at normal speed, the piano sounded an octave higher and twice as fast, giving it a timbre reminiscent of a harpsichord.
English journalist Kenneth Allsop suggested that Lennon write songs about his own childhood. Lennon responded by drafting a long poem built around a bus route he used to travel in Liverpool, naming stops including Penny Lane and Strawberry Field, before reworking the lyrics into a broader meditation on his past.
Rolling Stone placed "In My Life" at number 23 on its 2004 list of the 500 Greatest Songs of All Time and at number 98 on its 2021 revised version of the same list. It also ranked the song fifth on Rolling Stone's separate list of the Beatles' 100 Greatest Songs.
Bette Midler covered "In My Life" in 1991 for her film For the Boys. The recording reached number 20 on the U.S. Adult Contemporary chart in 1992.