EMusic Catalog Hits 4 Million Tracks

eMusic, which bills itself as the second largest music service after iTunes, announced Monday that its catalog is now more than four million tracks.

eMusic specializes in independent artists and labels, and focuses on music buyers older than 25 years of age. The service's roster features more than 40,000 record labels, the majority of which are available worldwide, according to the company. Recent additions to the catalog include new releases from Nine Inch Nails and classic titles from Liz Phair and Joan Jett and the Blackhearts.

eMusic sells music in MP3 format, which is playable by iTunes and other music players, and can also work on the iPod. eMusic doesn't use any Digital Rights Management (DRM) technology to protect its songs, so you're free to do what you want with the music you download.

While the iTunes Store operates on an "a la carte" basis for the most part, enabling you to buy individual songs and albums, eMusic operates on a subscription model: Users pay a monthly fee that enables them to download up to a specific number of songs (determined by the fee they pay).