Which innovative packaging format was introduced in 2004 to boost physical album sales and was described by the Recording Industry Association as 'the most successful new music format in over a decade'?

The physical presentation of music has evolved dramatically over the decades. From elaborate vinyl packaging to innovative digital delivery, the way music is packaged and presented to consumers reflects both artistic values and market strategies. This poll tests your knowledge about a significant packaging innovation that helped revitalize physical music sales in an era when digital downloads were threatening traditional formats.

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DualDisc (CD on one side, DVD on other)
Digipak (environmentally-friendly cardboard packaging)
Super Audio CD (SACD with high-resolution audio)
Deluxe Edition Box Sets (including exclusive merchandise)