In an effort to better track digital music sales, several big-name record companies, digital music services and music rights agencies have founded a consortium called Digital Data Exchange. The purpose of DDEX (pronounced "dee-dex") is to establish standards for the meta-data in digital music files, mainly for sales and rights-tracking purposes.
Founding members of the consortium include artists' rights group ASCAP, Sony BMG Music Entertainment, Warner Music Group, Universal Music Group and EMI Music, as well as several other music rights societies and agencies from the U.S., U.K. and Europe. Apple Computer, Microsoft and RealNetworks, which all provide digital music services, are also charter members.
News source: C|Net News.com