Everist, M. 2025. Review: Helen Deeming and Frieda van der Heijden, Medieval Polyphony and Song (Cambridge, Cambridge University Press, 2023), 248 pp., ISBN 978-1-107-15116-1 . Revista Portuguesa de Musicologia. 10, 1 (jun. 2025), 151–154. DOI:https://doi.org/10.57885/0045.rpmns.10/1.2023.