Answer
The Beatles were guided by Maharishi Mahesh Yogi, a renowned guru known for his teachings on Transcendental Meditation. During their stay at the Maharishi's ashram in Rishikesh, India, in 1968, the band members immersed themselves in meditation and spiritual practices, which significantly influenced their music and personal lives. This experience inspired several songs on their album "The White Album," including "Across the Universe" and "Hey Jude."