Which music retail innovation first implemented the 'pre-order bonus content' strategy that has now become standard practice for major album releases?

The music industry has undergone massive transformations in how products are sold and consumed over the decades. From vinyl records to digital streaming, retail technology has shaped how we discover and purchase music. This trivia question tests your knowledge about a pivotal moment in music retail history that changed how artists connected with consumers and revolutionized music sales strategies.

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iTunes' exclusive digital booklets (2003)
Amazon's AutoRip feature (2013)
Ticketmaster's album bundle with concert tickets (2017)
Best Buy's exclusive bonus tracks system (1999)