Which retail innovation did Apple's iTunes Store pioneer in 2003 that revolutionized how consumers could sample music before purchase?

In the rapidly evolving music retail landscape, technological innovations have transformed how consumers discover and purchase music products. From vinyl's resurgence to digital streaming platforms, the industry has seen revolutionary changes in retail experiences. This trivia question focuses on a major retail innovation that changed how music enthusiasts interact with new releases in physical store environments.

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

30-second song previews for all tracks in the digital store
Virtual reality headsets that simulated concert experiences
RFID-enabled physical albums that unlocked bonus content
Algorithmic recommendation system based on previous purchases