First edition with the melodies of an immensely significant ninth-century liturgical masterpiece. Winner of the Palisca Prize by the American Musicological Society, 2017 These two volumes present an important and distinctive collection of Carolingian poetry, composed for the liturgy in the last quarter of the ninth century by Notker Balbulus ("the stammerer"), monk of St Gall (d. 912). Notker was not the first liturgical composer inspired by the Carolingian renaissance of learning to make new texts for elaborate Alleluia melodies, but hewas certainly the first to raise the sequence genre to a consistently refined linguistic and theological level, and to provide a repertory for the annual cycle of holy feasts. His collection circulated widely in Germanic areas inthe tenth and eleventh centuries, while some of his compositions - such as Sancti spiritus - became staples throughout Europe. Notker's Liber ymnorum has never before been edited with the melodies after which his sequences were fashioned and to which they were sung. Provided here is a full edition of Notker's dedicatory preface, followed by 49 sequences. Each sequence is presented with two musical notations ("Carolingian", in neumes, and pitched on staves), followed by translations and an extensive commentary. A full introduction provides a context for the work.