Many music services see "free" as a way to grow paying users:

01/29/2013 | New York Times (tiered subscription model), The

Although almost all music services offer something for free, they usually are trying "to get listeners hooked so that they will eventually pay for access," Ben Sisario writes. However, Pandora is one of the few that, in trying to become a rival to free radio, has made ad-driven music a centerpiece of its service.

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New York Times (tiered subscription model), The

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