When Spotify launched its revolutionary streaming service, which innovative feature did they introduce that was NOT offered by competitors at that time?

Spotify's 2008 launch revolutionized the music industry, transforming how we consume music. This product launch dramatically shifted the industry from ownership to access models, impacting artist revenues, listener behaviors, and retail strategies. Test your knowledge about one of music's most significant product launches that disrupted traditional retail channels and created an entirely new distribution paradigm.

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Collaborative playlists allowing multiple users to add and edit songs together
Ad-supported free tier with limited skips
Offline listening mode for premium subscribers
Personalized algorithmic recommendations