Which band pioneered the use of the interactive 'zipper' packaging design on a major album release?

Product packaging in the music industry has evolved dramatically over the decades, often becoming as iconic as the music itself. From the introduction of gatefold album covers that allowed for expanded artwork to the development of special edition box sets, packaging innovations have helped artists create memorable brand experiences. This trivia question tests your knowledge about a revolutionary album packaging concept that changed how consumers interacted with physical music products.

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

The Rolling Stones for 'Sticky Fingers' (1971)
Pink Floyd for 'The Dark Side of the Moon' (1973)
Led Zeppelin for 'Physical Graffiti' (1975)
The Beatles for 'Sgt. Pepper's Lonely Hearts Club Band' (1967)