A new study by market research firm Comscore says that CD burning and file-sharing are having a "noticeable impact" on online sales of recorded music, Billboard Bulletin reports. The study estimates t

A new study by market research firm Comscore says that CD burning and file-sharing are having a "noticeable impact" on online sales of recorded music, Billboard Bulletin reports. The study estimates that online music sales through the third quarter of 2002 are declining even faster than overall U.S. sales.

Online sales for the first nine months of the year were valued at $545 million, down 25% from same period last year, according to Comscore. Nielsen SoundScan does not break out e-commerce sales figures.

The study points out that CD sales online have been slipping as traffic at peer-to-peer networks has increased. Comscore reports that traffic at file-sharing site KaZaA has grown from less than 1 million monthly at-home users in June 2001 to more than 10 million in September 2002.

On a quarter-to-quarter basis, Comscore reports that first-quarter online sales were off 12% from the same period last year, second quarter sales were off 28%, and third-quarter sales were off 39%. First-half sales fell 20% to $424 million.