Notker Balbulus (c.840-912), also known as Notker of St Gall or Notker the Stammerer, was a renowned Benedictine monk at the Abbey of St Gall in Switzerland who made substantial contributions to both the music and literature of his time. In this podcast Michael Alan Anderson, musical director of Schola Antiqua of Chicago, explains to Raymond Bisha the challenges of marrying elaborate melodies with threadbare musical notation to unravel the mediaeval mysteries behind plainsong performance.