This archive collects many digital resources originally published on the companion website for the book 'Medieval Song from Aristotle to Opera' by Sarah Kay. Included in this item are texts and translations, performance scores, and chapter-by-chapter performance reflections. The repertoire features troubadour and trouvère songs, works by Guillaume de Machaut, and related medieval song traditions. The materials were developed as an extension of the book's research, using performance to explore the sonic possibilities of medieval song. Audio and video recordings, including a recorded conversation between Sarah Kay and musical collaborator Christopher Preston Thompson discussing the project's research aims, are not available for download but are available in a comprehensive YouTube playlist.