artificial intelligence researchers at Harvard University applied bag-of-words modelling to the notes and chords of the song, and concluded that there was a 18.9% probability of McCartney having written the verse. Lennon was given an 81.1% certainty of writing the verses, while McCartney was given a 43.6% certainty of writing the middle eight. The analysts reported "a large amount of uncertainty" regarding the middle eight. Recording The song was recorded on 18 October 1965, and was complete except for the instrumental bridge. At that time, Lennon had not decided what instrument to use, but he subsequently asked George Martin to play a piano solo, suggesting "something Baroque-sounding". Martin wrote a Bach-influenced piece that he found he could not play at the song's tempo. On 22 October, the solo was recorded with the tape running at half speed, so when played back at normal pace the piano was twice as fast and an octave higher, solving the performance challenge and also giving the solo a unique timbre, reminiscent of a harpsichord. Legacy "In My Life" inspired pop music producers to use harpsichords in their arrangements. Rolling Stone magazine ranked "In My Life" number 23 on its 2004 list of "The 500 Greatest Songs of All Time", and number 98 on its 2021 list, as well as fifth on its list of the Beatles' "100 Greatest Songs". The song placed second on CBC's 50 Tracks. Mojo magazine named it the best song of all time in 2000. According to Acclaimed Music, as of 2020 it was the 194th most celebrated song in popular music history. Cover versions Ozzy Osbourne recorded a version for his 1995 album Under Cover. The album included further John Lennon covers, such as Working Class Hero and Woman. Siw Malmkvist recorded in Swedish, "I mitt liv" (1970) on her album Underbara Siw (Wonderful Siw), which was awarded a Swedish Grammis the same year. George Harrison did a soul-arranged version during his Dark Horse North American tour. Bette Midler recorded a version that was released as a single in early 1992 from the soundtrack of her movie For the Boys, It peaked at No. 20 on the Billboard Adult Contemporary chart in the U.S. This version later appeared on her 1993 hits album Experience the Divine: Greatest Hits. It was also used as background music for a tribute to NASCAR on ABC at the end of the 2000 Brickyard