quality:corruption, linguistic:voice_change
Music

Attention in recent decades to women of the medieval Catholic Church has led to a great deal of popular interest in Hildegard's music. In addition to the Ordo Virtutum, 69 musical compositions, each with its own original poetic text, survive, and at least four other texts are known, though their musical notation has been lost. This is one of the largest repertoires among medieval composers.

One of her better-known works, Ordo Virtutum (Play of the Virtues), is a morality play. It is uncertain when some of Hildegard's compositions were composed, though the Ordo Virtutum is thought to have been composed as early as 1151. It is an independent Latin morality play with music (82 songs); it does not supplement or pay homage to the Mass or the Office of a certain feast. It is, in fact, the earliest known surviving musical drama that is not attached to a liturgy.

The Ordo virtutum would have been performed within Hildegard's monastery by and for her select community of noblewomen and nuns. It was probably performed as a manifestation of the theology Hildegard delineated in the Scivias. The play serves as an allegory of the Christian story of sin, confession, repentance, and forgiveness. Notably, it is the female Virtues who restore the fallen to the community of the faithful, not the male Patriarchs or Prophets. This would have been a significant message to the nuns in Hildegard's convent. Scholars assert that the role of the Devil would have been played by Volmar, while Hildegard's nuns would have played the parts of Anima (the human souls) and the Virtues. The devil's part is entirely spoken or shouted, with no musical setting. All other characters sing in monophonic plainchant. This includes patriarchs, prophets, a happy soul, an unhappy soul, and a penitent soul along with 16 virtues (including mercy, innocence, chastity, obedience, hope, and faith).

In addition to the Ordo Virtutum, Hildegard composed many liturgical songs that were collected into a cycle called the Symphonia armoniae celestium revelationum. The songs from the Symphonia are set to Hildegard's own text and range from antiphons, hymns, and sequences (such as Columba Aspexit), to responsories. Her music is monophonic, consisting of exactly one melodic line. Its style has been said to be characterized by soaring melodies that can push the boundaries of traditional Gregorian chant and to stand outside the normal practices of monophonic monastic chant. Researchers are also exploring ways in which it may be viewed in comparison with her contemporaries, such as Hermannus Contractus. Another feature of Hildegard's music that both reflects the 12th-century evolution of chant, and pushes that evolution further, is that it is highly melismatic, often with recurrent melodic units. Scholars such as Margot Fassler, Marianne Richert Pfau, and Beverly Lomer also note the intimate relationship between music and text in Hildegard's compositions, whose rhetorical features are often more distinct than is common in 12th-century chant. As with most medieval chant notation, Hildegard's music lacks any indication of tempo or rhythm; the surviving manuscripts employ late German style notation, which uses very ornamental neumes. The reverence for the Virgin Mary reflected in music shows how deeply influenced and inspired Hildegard of Bingen and her community were by the Virgin Mary and the saints.