Steve Jobs stands by a projection of the iTunes website as he launches iTunes Music Store in 2004 in London. The iTunes store revolutionized music, allowing users to buy and download albums or individual songs from a library of 700,000 songs.
Amazon music downloads have grown and taken a bite out of Apple's iTunes.
In 2012, Amazon had 22 percent of paid music downloads in the United States, up 7 percent from 2011, according to the New York Times. The study, from the market research firm NPD Group, also reported that Apple's iTunes still has 63 percent of all paid downloads. The report said 44 million Americans purchased at least one song or album last year.