Which of these groundbreaking music products sold over 100 million units within its first year of release?

Test your knowledge of groundbreaking product innovations that transformed the music industry! Throughout history, certain products have fundamentally changed how we create, distribute, and consume music. These innovations didn't just succeed as products—they revolutionized entire musical landscapes, influenced cultural movements, and redefined artist-listener relationships. Can you identify which revolutionary music product launch created the biggest first-year sales sensation?

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Sony Walkman (1979)
Apple iPod (2001)
Apple Music streaming service (2015)
Spotify Premium subscription (2008)