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How they know what you like before you do

The high-tech tracking of people's preferences puts firms in touch with tastes.

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This kind of social interaction, the Berkman Center study predicts, will help democratize musical tastes. "Instead of primarily disc jockeys and music videos shaping how we view music, we have a greater opportunity to hear from each other.... These tools allow people to play a greater role in shaping culture, which, in turn, shapes themselves," the study states.

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The Berkman study found that 58 percent of participants said they were exposed to "a wider variety of music since using any online music service."

That kind of discovery is what Pandora is banking on. "People are so hungry to get reconnected with music," says Pandora founder Tim Westergren. "When you get into your 20s, music's just going to play a smaller role in your life.... You become another person who hasn't bought an album in - you name it - number of years."

To counteract that inertia, Mr. Westergren started the Music Genome Project. At Pandora's offices in Oakland, Calif., about 40 musicians classify about 8,000 songs per month. They identify a song's fundamental traits from among 400 possibilities. The traits of a Beatles song, for example, might include "melodic songwriting" and "a clear focus on recording studio production." By identifying these attributes, Pandora connects listeners with all kinds of music - from mainstream to obscure. At its website, people can enter a song or an artist that they enjoy. Based on the qualities of that song or artist, Pandora then plays other songs it thinks they'll like. If they like it, perhaps they will click on a link to an online store and buy the music - and Pandora will get a commission.

Movie renters are expanding their horizons, too. Customers have contributed more than 1 billion ratings on the Netflix website, says communications director Steve Swasey, adding that 60 percent of movies rented by its 4.2 million members are based on computer-generated recommendations. Those curious about what films are most popular can check out the Netflix Top 100, or they can enter their ZIP Code and find out what's hot in their neighborhood.

Community-driven Netflix recommendations are useful, says Mike Kaltschnee, who publishes a Web log, HackingNetflix.com, which is supported partly by Netflix and Blockbuster ads. Mr. Kaltschnee, who lives in Danbury, Conn., says he sees friends dropping red Netflix envelopes into the mail, and conversations about what people are watching start there, and then move online. "It's sort of turned into a little club," he says.

But advances in recommendation technology have raised concerns about privacy, too. Last month, iTunes customers complained about a new feature called "MiniStore," a list of personalized recommendations based on an individual's music library. Critics say Apple shouldn't have access to such information.

"The more that the company tries to get into the mind of the consumer, the more that they try to aggregate consumer information, there is the danger of blurring those lines of what is mine and what is yours," says Mr. Beyer of Riptopia.

Will Internet companies sell profiles of their customers to others? Westergren of Pandora says record companies have asked him many times "if any of this stuff is for sale." It never will be, he adds.

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