CF Apple Computer

Compact disc sales declined 19 percent in the last year, according to Nielsen SoundScan, which tracks retail sales. Downloads and mobile ringtones weren’t enough to make up for the drop. ITunes has sold more than 4 billion songs, Apple said in a separate statement. The Cupertino, Calif.-based company also said iTunes has more than 50 million customers who download music and other content. About 19 percent of U.S.

Internet users tried a peer-to-peer service, in which music files are swapped illegally, NPD reported. Legal music downloads accounted for 10 percent of music bought in the U.S., according to the survey.