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In page A Day in the Life:

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Lennon's lyrics were mainly inspired by contemporary newspaper articles, including a report on the death of Guinness heir Tara Browne. The recording includes two passages of orchestral glissandos that were partly improvised in the avant-garde style. In the song's middle segment, McCartney recalls his younger years, which included riding the bus, smoking, and going to class. Following the second crescendo, the song ends with one of the most famous chords in popular music history, played on several keyboards, that sustains for over forty seconds.[citation needed]