http://www.billboard.com/biz/article...-decade-report
After nearly a decade since selling its first digital song, Apple Inc.'s iTunes continues to dominate with a 63% unit share of the U.S. market for digital music downloads in the fourth quarter, according to estimates released Tuesday by the NPD Group Inc.
Amazon.com's MP3 store remained No. 2 with 22% market share, NPD said. The estimates are based on units, rather than revenue. Because iTunes discounts far less often than rival retailers, its dollar share of the $2.9 billion U.S. download market is likely to be greater than its unit share, though NPD did not provide dollar share figures. In terms of customers, a commanding eight out of 10 digital music buyers downloaded their albums or tracks from iTunes in the fourth quarter.
"There's a belief that consumers don't need to buy music because of streaming options," said Russ Crupnick, NPD's senior vice president of industry analysis.
"In fact, streamers are much more likely than the average consumer to buy music downloads."