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By February 1965, while on a skiing holiday in Switzerland, Lennon borrowed an instructor's guitar and began strumming the melody. George Martin, the band's producer, was immediately intrigued. However, collaborative songwriting was complicated by the duo's holiday schedules, with McCartney vacationing in Tunisia upon Lennon’s return to London. They reconvened on February 14, 1965, to finalize the composition that would soon climb the charts.