Which band pioneered the use of the 'zipper cover' on a physical album, where listeners could actually unzip a working zipper as part of the album artwork?

The music industry has seen remarkable innovations in physical album packaging over the decades, from simple cardboard sleeves to elaborate collector's editions. These packaging choices often reflect artistic vision, marketing strategy, and evolving consumer preferences. Test your knowledge about one of the most famous packaging innovations that changed how fans interacted with physical music media!

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The Rolling Stones for 'Sticky Fingers' (1971)
Led Zeppelin for 'Physical Graffiti' (1975)
Pink Floyd for 'The Wall' (1979)
The Beatles for 'Sgt. Pepper's Lonely Hearts Club Band' (1967)