Which music streaming service innovation is credited with finally making the subscription model profitable and mainstream after years of industry struggle?

The music industry underwent a massive transformation with the rise of subscription streaming services. These platforms changed how we consume music and saved an industry that was struggling with piracy. Test your knowledge about the evolution of music subscription services and the key innovations that shaped today's streaming landscape. Can you identify which breakthrough moment truly revolutionized the music business model?

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Spotify's introduction of the 'freemium' tier with ad-supported listening in 2008
Apple's launch of iTunes Radio in 2013 with curated stations
Pandora's implementation of the Music Genome Project for personalized recommendations in 2000
Tidal's exclusive high-fidelity audio quality subscription tier in 2015