Which music retail technology innovation first enabled legitimate 'all-you-can-listen' consumption, fundamentally shifting the industry from ownership to access-based models?

The music retail landscape has undergone dramatic transformations in how consumers discover and purchase music. One particular technological advancement revolutionized the industry by changing not just distribution channels but fundamentally altering how music revenue is generated. This shift represents one of the most significant retail technology advancements in music history, transforming physical product sales into service-based consumption. Test your knowledge about this pivotal industry change!

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Digital downloads via iTunes Store (2003)
Subscription streaming services via Spotify (2008)
Music identification technology via Shazam (2002)
MP3 players via Apple iPod (2001)