Which machine learning innovation significantly improved music recommendation algorithms on e-commerce platforms around 2015, leading to a 30% increase in customer discovery of new artists?

The digital transformation of music retail has created entirely new business models and customer engagement strategies. From vinyl's surprising comeback to streaming platform dominance, music retailers have pioneered innovative e-commerce approaches. This trivia question explores a key technological development that revolutionized how music products are marketed and recommended to consumers online.

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

Deep neural networks analyzing sonic patterns across millions of tracks
Blockchain-based recommendation engines tracking user preferences
Visual recognition systems matching album artwork to user preferences
Sentiment analysis of social media posts about music preferences