What's your favorite band?

A test version of the niche social networking site MOG.com launched on Tuesday with the aim of hooking up people based on their taste in music -- a sort of Myspace for music junkies.

The free site, started by former MTV marketing executive David Hyman with $1.4 million from private investors, requires users to download its application, mog-o-matic. The application catalogs the music on users' computer hard drives and monitors what they play the most and what new tunes are added through online downloads and portable music players.

The data is analyzed several ways and is posted to users' MOG web pages, which are open to inspection by the online world at large. Users also are encouraged to create blogs on their pages about their favorite music. The company does not generate music recommendations from the data but does provide 30-second sound links to all users' collections as well as links to Apple's iTunes Music Store and online music retailer Amazon.com.