Which innovative pricing strategy did Radiohead use for their 2007 album 'In Rainbows' that challenged traditional music industry revenue models?

In the age of digital music consumption, streaming services have dramatically transformed how music is priced and sold to consumers. This shift represents one of the most significant business model changes in the industry's history, moving from ownership to access-based models. Test your knowledge about how the music industry has adapted its pricing strategies in response to technological disruption and changing consumer preferences.

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Pay-what-you-want model where fans could download the album for any price they chose, including for free
Subscription-only release requiring fans to pay a monthly fee for continued access to the album
Tiered pricing system where higher payments unlocked additional bonus tracks and content
Blockchain-based NFT release where each song was sold as a limited digital collectible