Which band's album was the first to feature the now-standard cardboard gatefold sleeve design, allowing for more artwork space and liner notes?

Album packaging design has been an integral part of music marketing and artistic expression for decades. From gatefold sleeves to innovative materials, album covers have become cultural artifacts that sometimes reach iconic status. This trivia question explores one of the most revolutionary packaging designs in music history that changed how consumers interact with physical music products. Test your knowledge about this groundbreaking innovation!

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The Beatles with 'Sgt. Pepper's Lonely Hearts Club Band' (1967)
The Mothers of Invention with 'Freak Out!' (1966)
Pink Floyd with 'The Piper at the Gates of Dawn' (1967)
Bob Dylan with 'Blonde on Blonde' (1966)