Final answer:
George Martin orchestrated an instrumental crescendo to bridge the gap between John Lennon's and Paul McCartney's parts in 'A Day in the Life', providing a unique and chaotic sound that connected the two sections of the song.
Step-by-step explanation:
George Martin, known as the fifth Beatle, played a pivotal role in the production of The Beatles song 'A Day in the Life'. He filled the space between John Lennon's and Paul McCartney's parts by arranging an orchestral crescendo. This instrumental interlude created tension and built a powerful segue from Lennon's dreamy verses to McCartney's middle section. The orchestra was instructed by Martin to go from the lowest note they could play to the highest at their own pace, resulting in a chaotic and unique sound that served as a bridge connecting the parts of the song composed by Lennon and McCartney.