Which innovative advertising technique did Radiohead use in 2007 that revolutionized music distribution and pricing?

The music industry has created some of the most innovative advertising campaigns in retail history. From iconic album release strategies to groundbreaking digital promotions, music marketers have pioneered techniques that transformed both artists and their products into cultural phenomena. Test your knowledge about the advertising techniques that have shaped the modern music landscape and revolutionized how we discover and consume music.

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The 'pay-what-you-want' model for their album 'In Rainbows', allowing fans to set their own price or download it for free
Hiding USB drives containing their album in public locations worldwide, creating a global scavenger hunt
Releasing their album exclusively on vinyl with QR codes that unlocked digital content when scanned
Creating personalized songs for the first 10,000 fans who pre-ordered their album using AI technology