Seemingly, sales of online music have flattened in recent months. This is after sharp growth earlier this year.

Digital audio sales reached 6.8 million tracks this week, according to Nielsen SoundScan, only 3 percent higher than the 6.6 million songs purchased in the last week of May.

If stagnant sales are a trend, it could be worrisome for services like Apple's iTunes Music Store, which is responsible for about 80 percent of legal downloads.
Some providers, such as Yahoo, had hoped that customers would be willing to pay more for digital audio services. These figures may make them think again.