The Written Notation of Medieval Music - Illustrated examination by Nigel remarking on clefs and staves, rhythm, note groups, and special symbols. Traces Franco's influence and shows forward and backward compatibility of the form. [PDF] - http://www.bandsman.co.uk/download/medieval.pdf
Franco of Cologne, (c. 1240 - c. 1280), Germany - Biographical data, recommended CDs, books and sheet music, bibliography, and links to biographical essays. - http://stevenestrella.com/composers/composerfiles/franco1280.html