Which music streaming service was the first to introduce algorithmic personalized playlists that created custom recommendations based on a user's listening habits?

The music industry has undergone dramatic transformation in how consumers access and purchase music. From vinyl records to digital downloads to today's streaming services, each technological shift has reshaped business models and listener experiences. This trivia question focuses on a pivotal moment in digital music retail that changed how we consume music forever.

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Spotify with 'Discover Weekly' in 2015
Apple Music with 'For You' playlists in 2014
Pandora with its Music Genome Project in 2010
YouTube Music with 'Your Mix' in 2013