Apple Claims Wal-Mart's Spot as No. 1 Music Retailer
Apple has sold more than 4 billion iTunes tracks since launching in 2003.<img src="http://feeds.foxbusiness.com/~r/foxbusiness/latest/~4/263566083" height="1" width="1"/><img src="http://feeds.foxnews.com/~r/foxnews/business/~4/263567925" height="1" width="1"/>
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