After another year of plunging music sales, record company executives are starting to contemplate the unthinkable: The digital music business, held out as the future of the industry, may already be as big as it is going to get.
The International Federation of the Phonographic Industry, a trade group based in London, said last week that sales of music in digital form had risen only 6 percent worldwide in 2010, even as the overall music market had shrunk 8 percent or 9 percent, extending a decade-long decline.
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