Which music retail innovation from the 1990s revolutionized how album sales were tracked and contributed to more accurate Billboard chart rankings?

The music industry has undergone remarkable transformations in how people discover, purchase, and consume music. From vinyl record shops to digital streaming platforms, the retail landscape has continuously evolved. This trivia question explores an interesting aspect of music retail history that changed how artists connected with fans and how the industry tracked commercial success.

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SoundScan (point-of-sale barcode scanning technology)
Columbia House Record Club (mail-order subscription service)
MusicNet (early digital download platform)
Tower Records' Listening Stations (in-store sampling kiosks)