Which innovative music pricing strategy first emerged in the early 2000s that fundamentally changed the industry's revenue model?

The music industry has undergone dramatic transformations in how products are priced and monetized over the decades. From physical media to streaming services, pricing strategies have evolved to match consumer behavior and technological capabilities. This trivia question explores a pivotal moment in music retail pricing history that changed how consumers accessed music.

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The 99-cent individual song download model pioneered by iTunes
The subscription-based unlimited streaming model (like early Spotify)
The 'pay-what-you-want' model first used by Radiohead's 'In Rainbows'
The bundled music service with hardware purchase (like early Beats Music)