Which album is credited with introducing the first commercial gatefold sleeve design that became a standard format for premium album releases?

Album packaging has evolved dramatically from simple paper sleeves to elaborate artistic statements that enhance the musical experience. Throughout history, certain album packages have revolutionized how we interact with music physically and visually. This poll tests your knowledge of groundbreaking packaging innovations that changed how we experience music beyond just listening. Can you identify which famous album introduced a truly revolutionary packaging concept?

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The Beatles' 'Sgt. Pepper's Lonely Hearts Club Band' (1967)
Bob Dylan's 'Blonde on Blonde' (1966)
Pink Floyd's 'The Dark Side of the Moon' (1973)
The Rolling Stones' 'Sticky Fingers' (1971)