For some time now the Medieval Academy of America with the support of the National Endowment for the Humanities and the Andrew W. Mellon Foundation has offered several of its classic publications on medieval music for free download, including:
Apel, Willi/ French Secular Music of the Late Fourteenth Century. Edited by WILLI APEL. Literary texts edited by ROBERT W. LINKER and URBAN T. HOLMES, JR. Medieval Academy Books, No. 55 (1950).
Ellinwood, Leonard/ The Works of Francesco Landini. Edited by L. ELLINWOOD. Medieval Academy Books, No. 36 (1945).
Hewitt, Helen/ Harmonice musices Odhecaton A. Edited by HELEN M. HEWITT. Literary texts edited by ISABEL POPE. Medieval Academy Books, No. 42 (1942).
Marrocco, W. Thomas/ Fourteenth-Century Italian Cacce. Edited by W. T. MARROCCO. Second Edition, Revised. Medieval Academy Books, No. 39 (1961).
Switten, Margaret Louise/ The Cansos of Raimon de Miraval: A Study of Poems and Melodies. By MARGARET LOUISE SWITTEN. Medieval Academy Books, No. 93 (1985). [NB. Properly belongs in the Troubadours/Trouvères group]
Also links to the useful reference tool:
Lynn Thorndike and Pearl Kibre, A Catalogue of Incipits of Mediaeval Scientific Writings in Latin (Cambridge, MA: Mediaeval Academy, 1963) and supplements.
For further details, see http://www.medievalacademy.org/BooksOnline.html.
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Merci Jason !