Since the ninth century, the routes to Santiago de Compostela leading to the sanctuary of St. James have attracted countless pilgrims and exercised a potent mystique. What has received less attention is the music originally sung during the services in honour of the saint. Thanks to Marcel Pérès’s in-depth study of the Codex Calixtinus, preserved at the Cathedral of Santiago, this recording can present a reconstruction of the musical gems contained in the rare twelfth-century manuscript which attests to multiple stylistic influences encountered on this indispensable and all-embracing pilgrimage.