http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
v. 1. Gluck ; Mozart ; Beethoven ; Carl Maria von Weber -- v. 2. Meyerbeer ; Richard Wagner.
From the Howard Mayer Brown, Edward Downes and Mary Schieffelin Book Collections, October 2004.