Which music product launch initially faced significant industry skepticism but went on to sell over 100 million units in its first six years, revolutionizing music consumption?

The music industry has seen countless product launches that have transformed how we listen to and experience music. From vinyl to streaming services, each innovation has shaped consumer behavior and industry economics. This trivia question explores a pivotal product launch that defied expectations and changed the trajectory of music consumption. Test your knowledge of music industry history and the strategic decisions that created new market paradigms!

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Apple's iPod (2001)
Sony's Walkman (1979)
Spotify's streaming service (2008)
Amazon's Echo with Alexa (2014)