A new survey by the Pew Internet & American Life Project reveals that the number of people who say they download music — both legally and otherwise — swelled to 23 million, an increase of 28 percent since the last survey in December.

New online music services, such as Apple’s iTunes Music Store, Musicmatch and the new Napster, are gaining an audience, attracting about 11 million people over the past six months. But they’re far from trumping the popularity of Kazaa and the other major file-sharing networks, which draw some 27.5 million American users, according to comScore Media Metrix, an Internet audience measurement firm that participated in the Pew study.

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