Which product launch transformed Apple into the dominant force in music retail, eventually capturing over 70% of the digital music market?

In the competitive world of music retail, product launches can redefine how we experience and purchase music. One particular product launch in 2001 revolutionized the music industry and transformed a computer company into the world's most influential music retailer. This launch created a new ecosystem that would eventually change how artists distribute their work and how consumers build their music libraries. Test your knowledge of this pivotal moment in music retail history!

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iPod with iTunes Store integration (2003)
Apple Music streaming service (2015)
GarageBand music production software (2004)
Beats by Dre acquisition (2014)