Which album packaging design innovation is credited with introducing the first commercially successful gatefold sleeve specifically designed to enhance the concept album experience?

The visual presentation of music has always been a crucial part of the industry's marketing strategy. Album packaging design has evolved from simple cardboard sleeves to elaborate collector's items that enhance the musical experience. This trivia tests your knowledge about revolutionary album packaging designs that changed how we experience music physically. Can you identify which iconic packaging innovation truly disrupted the industry and set new standards for visual storytelling in music?

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The Beatles' 'Sgt. Pepper's Lonely Hearts Club Band' (1967) with its elaborate cardboard cutouts and printed lyrics
Pink Floyd's 'The Dark Side of the Moon' (1973) with its prism spectrum design and poster inserts
The Rolling Stones' 'Sticky Fingers' (1971) with its functional zipper on the front cover
Led Zeppelin's 'Physical Graffiti' (1975) with its die-cut windows revealing interchangeable images