The manuscript sources of medieval song rarely fit the description of 'songbook' easily. Instead, they are very often mixed compilations that place songs alongside other diverse contents, and the songs themselves may be inscribed as texts alone or as verbal and musical notation. This book looks afresh at these manuscripts through ten case studies, representing key sources in Latin, French, German, and English from across Europe during the Middle Ages. Each chapter is authored by a leading expert and treats a case study in detail, including a listing of the manuscript's overall contents, a summary of its treatment in scholarship, and up-to-date bibliographical references. Drawing on recent scholarly methodologies, the contributors uncover what these books and the songs within them meant to their medieval audience and reveal a wealth of new information about the original contexts of songs both in performance and as committed to parchment.