Sony BMG, a joint venture of Sony (SNE) and Bertelsmann, will make at least part of its collection available without so-called digital rights management, or DRM, software some time in the first quarter, according to people familiar with the matter.

Sony BMG would become the last of the top four music labels to drop DRM, following Warner Music Group (WMG), which in late December said it would sell DRM-free songs through Amazon.com’s (AMZN) digital music store. EMI and Vivendi’s Universal Music Group announced their plans for DRM-free downloads earlier in 2007. [Business Week]

In other industry news, according Nielsen Soundscan it was another bad year for CD sales.

U.S. album sales plunged 9.5 percent last year from 2006, continuing a downward trend for the recording industry, despite a 45 percent surge in the sale of digital tracks, according to figures released Thursday.

Even strong sales of The Eagles’ comeback album has failed to halt the industry’s blues.

A total of 500.5 million albums sold as CDs, cassettes, LPs and other formats were purchased last year, down 15 percent from 2006’s unit total, said Nielsen SoundScan, which tracks point-of-purchase sales. [CNN.com]