Which music retail analytics innovation, introduced in 1991, first allowed the Billboard charts to accurately track actual album sales rather than relying on store reporting estimates?

The music retail landscape has transformed dramatically in the digital age. Physical record stores once dominated the market, but streaming services and digital platforms have revolutionized how consumers purchase and experience music. This trivia question tests your knowledge of a significant retail analytics milestone that changed how the music industry tracks consumer behavior and sales performance.

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SoundScan (now Luminate Data)
MusicMetric
Nielsen AudioTrack
BDS (Broadcast Data Systems)