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The Doctor is in — your smartphone

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You don’t have to be a hip-hop fan to listen to Dr. Dre. The rapper and entrepreneur has built a $1.2 billion business selling gaudy audio gear. Those huge headphones you see on subway riders are probably his. Now Dre’s giving us something else to hear — millions of tunes, available practically anywhere.

Beats Music, which launched on Tuesday, is the latest service to deliver streams of Internet music to our computers and mobile devices. But perhaps we should abandon the word “streaming” — a tidal wave is more like it.

Internet music was popular only with deskbound nerds a decade ago. But these days, hordes of us are tuning in.

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