The 50 most popular websites installed a total of 3,180 tracking files on a test computer used by The Wall Street Journal to measure the industry's reach. iStockphoto.com hide caption

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iStockphoto.com

Tracking The Companies That Track You Online

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Paper Trombones Todd Sickafoose
Music from Comandante Alberto Iglesias
The Commute Turtle Island String Quartet
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The Commute
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A Shock to the System
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Turtle Island String Quartet

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Raga Matt Wilson
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Raga
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Humidity
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Matt Wilson

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Not for Nothin' Dave Holland Quintet

If Steve Coleman's music sounds a little chilly sometimes, it's because he's more interested in compositional logics than setting a mood. Courtesy of the artist hide caption

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Steve Coleman: 'Harvesting' Funky, Brainy Jazz

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Clouds Steve Coleman & Five Elements
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Clouds
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Harvesting Semblances and Affinities
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Steve Coleman & Five Elements

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Clumsy Ol' World John Mellencamp
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Clumsy Ol' World
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No Better Than This
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John Mellencamp

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