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So far this year, 1.01 billion track downloads have been sold in the United States, down 4 percent from the same time last year, according to the tracking service Nielsen SoundScan. Album downloads are up 2 percent, to 91.9 million; combining these results using the industry’s standard yardstick of 10 tracks to an album, total digital sales are down almost 1 percent.

After enjoying double-digit growth in the years after Apple opened its iTunes store in 2003, song downloads began to cool several years ago. But the rate of decline this year — weekly sales began to lag in February, and the drop has accelerated rapidly in recent months — has caught the business by surprise.

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– http://www.nytimes.com/2013/10/21/business/media/as-downloads-dip-music-executives-cast-a-wary-eye-on-streaming-services.html?ref=todayspaper