Which of these music platforms was the first major legal digital music store that helped shift the industry from physical sales to downloads?

Before Spotify dominated the music streaming landscape, several platforms attempted to revolutionize how we access music. This trivia question explores the groundbreaking e-commerce platform that first successfully commercialized legal music streaming and downloads, fundamentally changing artist revenue models and consumer listening habits in the digital age. Test your knowledge of music retail history!

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Apple's iTunes Store (2003)
Napster (1999)
Amazon MP3 Store (2007)
Beatport (2004)