Which digital music retail innovation first surpassed physical CD sales in annual revenue in the United States?

The music industry has undergone massive transformations in how consumers purchase and access music. From vinyl records in specialty stores to digital downloads and now streaming services, the retail landscape has continuously evolved. This poll tests your knowledge about a pivotal moment in music retail history that changed consumer behavior forever.

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

Apple's iTunes Store digital downloads (2012)
Spotify and other streaming services (2010)
Amazon MP3 store (2009)
Ringtone purchases for mobile phones (2008)