http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
"The growth of music through the centuries, illustrated by examples of ancient, mediaeval, classical, national, traditional and popular songs; with historical and analytical notes on their development, structure, and characteristics".
"Words and melody of all the songs in this book are published separately under the title, "Songs of the ages"".
Songs of the ages : pupil's companion to Musical appreciation through song