The songwriting styles, the studio records, and the individual careers all show that there was a very large influence in the group, and in the music, by Paul McCartney. Equal to Lennon in the beginning, but surpassing him at the conclusion of the relationship. Two key factors that probably caused this are his affection and infatuation with Yoko Ono, and the heavy use of hallucinogenic drugs. On some occasions, both of those factors
may have given Lennon inspiration for his music, but they greatly reduced his control and influence in the band.
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