Which music industry product launch in 2003 revolutionized digital music retail and eventually led to the mainstream adoption of legal music downloads?

The music industry has undergone tremendous transformation in how products are developed, marketed, and sold to consumers. From vinyl records to streaming services, the technology behind music consumption continues to evolve rapidly. This poll tests your knowledge about a significant product development shift that revolutionized how consumers purchase and interact with music.

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Apple's iTunes Store
Spotify's streaming platform
Amazon MP3 Store
Napster 2.0 subscription service