Which e-commerce innovation first introduced the 'Customers Who Bought This Also Bought' recommendation algorithm that dramatically changed music discovery and purchasing patterns?

The music retail landscape has dramatically transformed in the digital age. From vinyl records to digital streaming, the industry has continuously adapted to technological changes. This trivia question explores a pivotal e-commerce innovation that revolutionized how consumers discover and purchase music online, reshaping artist promotion strategies and consumer engagement in the process.

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Amazon's music store (1998)
iTunes Music Store (2003)
Napster's legal relaunch (2003)
Bandcamp's artist platform (2008)