Which innovative pricing model did Radiohead introduce with their 2007 album 'In Rainbows' that challenged traditional music retail strategies?

The music industry has undergone revolutionary changes in how consumers access and pay for music. From physical albums to digital downloads to subscription streaming models, pricing strategies have continuously evolved to adapt to technology and consumer preferences. Test your knowledge about a significant pricing innovation that changed how we value music consumption!

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Pay-what-you-want digital download (allowing fans to determine their own price, including $0)
Tiered subscription model (offering different access levels based on monthly payment)
Bundle pricing (album came free with purchase of concert tickets)
Time-limited free streaming followed by mandatory purchase to continue listening