Hildegard was a prolific composer, and wrote music to fill religious needs in her convent such as music for Offices, Masses and special services. Hildegard wrote Columba aspexit's text and music for a special church service: a Mass honoring Saint Maximus. This piece was written in plainchant: a single melody sung by a soloist or choir. Hildegard's melody features syllabic, neumatic and melismatic passages. These terms are used to indicate that instead of each syllable of the text being sung to a single note (syllabic), some syllables call for several notes (neumatic) or many notes per syllable (melismatic). Hildegard used this technique and a soaring melody with a wide range to highlight and emphasize the descriptive imagery of her poetic text.
As illustrated in Fig. 1.5, an image of Hildegard’s Columba Aspexit manuscript, during the Medieval period, rhythm was not notated. Musically, this is described as "free rhythm" or "unmeasured rhythm" meaning, the rhythm is set by the performer. The musical form used in this piece is called a sequence: a chant of the Mass sung between sections called the Alleluia and the Gospel. In this form, each melodic phrase is generally sung twice, with a slight variation the second time: AA'BB'CC'. Although Hildegard's Columba aspexit manuscript is notated only for voice, she apparently approved of the use of instruments with her music. She wrote in one of her books of visions: "We are to praise God with the trumpet, harp, zither, organ, drum, strings, flute, cymbals, dance."  Stringed instruments played during the Medieval period included rebecs and Medieval fiddles, and a fiddle is shown in the image below from one of Hildegard's books of visions.
Fig. 1.6 Heavenly Musicians, 1240
TECHNIQUE TIPS: During Hildegard's time, if a stringed instrument such as a rebec or medieval fiddle were to play along with the vocal part of Columba aspexit, the instrumental part would likely have been a drone: one sustained note throughout the entire piece (an open D in this arrangement). To try this, place your bow at the frog and begin with a down-bow, playing long, smooth bow strokes on your open D as the melody line is played or sung. When you change bows, do so as smoothly as possible so your note will sound sustained and unbroken throughout the piece. While playing, you may want to watch your bow to make sure you're able to draw it in a straight line, parallel between the bridge and the fingerboard.
Although Hildegard's Columba Aspexit melody was intended for singers, it has been included in this collection of pieces to provide an example of music from this era. Hildegard's melody features a lovely soaring melodic line that floats up and down, mirroring the expressive text with phrases that seem to call for slight pauses. Experiment with slurs and bow changes to see how you can create a smooth, flowing melody and decide when and where you feel the need to slightly pause your bow to indicate when you have reached the end of a musical phrase.