Which customer behavior metric became uniquely measurable for the music industry only after the rise of streaming platforms?

The music industry has undergone radical transformation with streaming services dominating how consumers access music. This trivia question explores how streaming platforms have changed retail customer analytics in the music business, revealing insights about consumer behavior that weren't possible in the physical album era. Test your knowledge about how data analytics has reshaped how music companies understand their audiences!

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Skip rates (percentage of times users skip a song before completion)
Geographic distribution of sales
Age demographics of purchasers
Genre preferences of consumers