A detailed inventory of polyphonic songs from 1415-1480 in any European language, with language subdivisions: English, French, German (including Flemish), Italian, Latin, Spanish, and textless (this last with musical incipits). Each entry includes full details of all sources, facsimiles, modern editions, paraphrases, citations, etc. The aim is to account for everything that survives or is confidently known to have existed. There are approximately 2,000 main entries, derived from some 200 central sources, with another 200 sources that contain only a few pieces, poetic texts, or otherwise related material. The volume also includes brief descriptions of all the main sources as well as biographical entries for all the composers and poets (keyed to the main catalogue) and an extensive bibliography.