Music Clubs' Newfound Clout

By mining customer data and putting the Web to good use, the discount sellers can make stars and reap the rewards of boosting labels' sales

The biggest breakout artist in 2001 was R&B crooner Alicia Keys. Her album, Songs in A Minor, sold more than 5 million copies, and the 20-year-old artist took home five Grammys, including ones for song of the year and best new artist.

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