Universal Music Group sued MySpace.com on Friday, alleging that the social networking site that bills itself as a source of "user generated" content instead trades on "user stolen" songs and music videos.

The lawsuit, filed in U.S. District Court in Los Angeles, described MySpace as a "vast virtual warehouse" of pirated works from some of the company's best-known artists, including Mariah Carey, Diana Krall and U2. Universal claims that "no intellectual property is safe" from the alleged copyright infringement, even unreleased albums such as Jay-Z's "Kingdom Come."