Which groundbreaking pricing innovation did Spotify introduce in 2008 that helped legitimize music streaming as a viable business model?

The music industry has undergone dramatic shifts in revenue models over the past two decades. Streaming services have revolutionized how consumers access music and how artists and labels generate income. This trivia question explores a pivotal moment in the pricing strategy evolution of one of the industry's most influential streaming platforms.

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The 'freemium' model combining ad-supported free tier with premium subscription options
The 'pay-what-you-want' sliding scale pricing structure
The 'family plan' allowing up to 6 household members on one subscription
The 'artist-direct' model where 90% of subscription fees went directly to played artists