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Apple's iTunes grows to No. 2 U.S. music retailer
Based on 2007 sales, legal music downloads now account for 10 percent of music acquired in the United States, but the increase failed to offset a decline in physical CD sales, NPD said.
The amount of music purchased by consumers rose 6 percent from a surge in digital music sales. But actual spending rates across the industry declined by 10 percent due to lackluster CD sales, dropping from about $44 per capita to $40 among Internet users.
About one million consumers stopped buying CDs in 2007, according to NPD.
The iTunes store now has more than 50 million customers and has sold more than 4 billion songs, Apple said in a separate statement.
(Reporting by Michele Gershberg and Kenneth Li; Editing by Lisa Von Ahn, Phil Berlowitz)