A new digital analysis of medieval music manuscripts suggests that the political divisions of early medieval Europe influenced how liturgical music circulated across the continent. By examining thousands of musical insertions known as tropes, researchers have shown that the distribution of these chants closely reflects the territorial boundaries established after the Carolingian Empire was divided in the ninth century.
The study, published in Transactions of the International Society for Music Information Retrieval, analyzed more than 4,000 trope elements preserved in medieval manuscripts dating from the ninth to the fourteenth centuries. Using computational network models, the research traced how these musical additions to Gregorian chant were transmitted across Western Europe and how their spread was shaped by geography and politics.
A Distinctive Genre of Medieval Chant
An example of a trope: The chant “Viri Galilei” (center and highlighted in red) deals with the Ascension of Christ and how the apostles perceived this event. The trope introduces the following before the chant: “The apostles marveled, and the angels spoke to them.” (Image: Bibliothèque nationale de France / gallica.bnf.fr)
Tropes were additions inserted into established Gregorian chants. They could include new words, new melodies, or a combination of both, expanding the original liturgical piece and sometimes offering additional theological or rhetorical commentary.
In many cases, tropes circulated long before they were recorded in writing. Their melodies and texts were transmitted orally for centuries before being preserved in medieval manuscripts, creating a complex web of regional variants across Europe.
The researchers focused on the smallest identifiable units within these additions, known as trope elements. These individual segments—ranging in length from a few words to extended passages—can be traced across multiple manuscripts, making them useful for studying how chant traditions moved between regions.
To investigate this process, the study drew on a large dataset derived from the Corpus Troporum, a scholarly catalog of medieval trope manuscripts. The dataset links 163 manuscripts with 4,407 individual trope elements, producing more than 18,000 recorded occurrences of these musical insertions.
On average, a manuscript contains about 112 trope elements, while a typical trope appears in roughly four manuscripts, indicating that many tropes circulated widely while others remained localized traditions.
Mapping Medieval Musical Communities
Enluminated Gregorian manuscript of the Trinitarian hymn in the Laudario of Florence – Wikimedia Commons
To analyze this material, the researchers used a statistical network model that groups manuscripts based on the trope elements they share. By identifying patterns in these connections, the model can reveal clusters of manuscripts that likely belonged to related musical traditions.
The results showed a striking pattern: manuscripts tended to cluster into groups that correspond broadly to major political regions of medieval Europe.
At the broadest level, the analysis identified four major manuscript communities:
a West-Frankish group, largely corresponding to the territories ruled by Charles the Bald
an East-Frankish group, associated with the lands of Louis the German
an Italian group
and a fourth, more geographically dispersed cluster linking Italy with areas as far away as Britain.
These groupings closely mirror the political landscape that emerged after the mid-9th century, which divided the Carolingian Empire among the sons of Emperor Louis the Pious.
“It became apparent that the spread of the clusters was severely restricted by the political borders of the time following the Treaty of Verdun in 843 AD,” explains Tim Eipert of Julius-Maximilians-Universität Würzburg, one of the study’s authors. “Cultural exchange regarding the chorales apparently took place little beyond the borders of the empires at that time.”
A Musical Map of Medieval Europe
The study also revealed more complex patterns beneath this broad division. At finer levels of analysis, the model detected smaller regional traditions within these larger clusters.
How have politics shaped music making in the past? Using sophisticated generative network models, @timeipert‘s work in @TismirJ shows a close link between political boundaries in central Europe towards the end of the first millennium and the repertoire of chants in use. pic.twitter.com/T2lfaDTm8D
One particularly intriguing pattern was a cultural corridor connecting Italy with parts of northern Europe and Britain. This alignment resembles what some historians have called the “Lotharingian axis”—the long stretch of territory from the North Sea to Italy that fell under the rule of King Lothar I after the Treaty of Verdun.
Such findings suggest that political and institutional connections may have helped shape the circulation of liturgical music across long distances.
Beyond Geography
While geography played an important role, the researchers caution that it cannot explain every pattern observed in the manuscripts. A significant number of cases show connections between manuscripts that do not neatly follow regional borders. These may reflect other forms of medieval mobility, including monastic networks, pilgrimage routes, or the movement of clergy and manuscripts between institutions.
The dataset itself also has limitations. The classification of trope elements is based primarily on textual features rather than melodic differences, meaning that some tropes with different musical settings may appear identical in the dataset.
Future research may expand the model to incorporate melodic variation, chronological data, and the sequence of trope elements within chants, potentially offering an even clearer picture of how medieval music traveled across Europe.
Digital Methods and Medieval Music
Beyond its specific findings, the study demonstrates how computational tools can shed new light on medieval cultural history. By combining large digital datasets with statistical modeling, scholars can detect patterns that would be difficult to see through traditional manuscript comparison alone.
“The study demonstrates how powerful data-driven methods can be for historical musicology,” Eipert notes, adding that the same approach could be applied to other musical repertoires and even to entirely different types of cultural data.
For medieval chant studies, however, the findings already offer a striking insight: the political borders drawn in the ninth century did not only reshape kingdoms—they also helped shape the soundscape of medieval Europe.
The article, “Inferring Communities of Medieval Music Manuscripts Using Stochastic Block Models,” by Tim Eipert and Fabian C. Moss, is published in Transactions of the International Society for Music Information Retrieval. Click here to read it.
Top Image: Monks chanting. British Library MS Yates Thompson MS 43
A new digital analysis of medieval music manuscripts suggests that the political divisions of early medieval Europe influenced how liturgical music circulated across the continent. By examining thousands of musical insertions known as tropes, researchers have shown that the distribution of these chants closely reflects the territorial boundaries established after the Carolingian Empire was divided in the ninth century.
The study, published in Transactions of the International Society for Music Information Retrieval, analyzed more than 4,000 trope elements preserved in medieval manuscripts dating from the ninth to the fourteenth centuries. Using computational network models, the research traced how these musical additions to Gregorian chant were transmitted across Western Europe and how their spread was shaped by geography and politics.
A Distinctive Genre of Medieval Chant
Tropes were additions inserted into established Gregorian chants. They could include new words, new melodies, or a combination of both, expanding the original liturgical piece and sometimes offering additional theological or rhetorical commentary.
In many cases, tropes circulated long before they were recorded in writing. Their melodies and texts were transmitted orally for centuries before being preserved in medieval manuscripts, creating a complex web of regional variants across Europe.
The researchers focused on the smallest identifiable units within these additions, known as trope elements. These individual segments—ranging in length from a few words to extended passages—can be traced across multiple manuscripts, making them useful for studying how chant traditions moved between regions.
To investigate this process, the study drew on a large dataset derived from the Corpus Troporum, a scholarly catalog of medieval trope manuscripts. The dataset links 163 manuscripts with 4,407 individual trope elements, producing more than 18,000 recorded occurrences of these musical insertions.
On average, a manuscript contains about 112 trope elements, while a typical trope appears in roughly four manuscripts, indicating that many tropes circulated widely while others remained localized traditions.
Mapping Medieval Musical Communities
To analyze this material, the researchers used a statistical network model that groups manuscripts based on the trope elements they share. By identifying patterns in these connections, the model can reveal clusters of manuscripts that likely belonged to related musical traditions.
The results showed a striking pattern: manuscripts tended to cluster into groups that correspond broadly to major political regions of medieval Europe.
At the broadest level, the analysis identified four major manuscript communities:
These groupings closely mirror the political landscape that emerged after the mid-9th century, which divided the Carolingian Empire among the sons of Emperor Louis the Pious.
“It became apparent that the spread of the clusters was severely restricted by the political borders of the time following the Treaty of Verdun in 843 AD,” explains Tim Eipert of Julius-Maximilians-Universität Würzburg, one of the study’s authors. “Cultural exchange regarding the chorales apparently took place little beyond the borders of the empires at that time.”
A Musical Map of Medieval Europe
The study also revealed more complex patterns beneath this broad division. At finer levels of analysis, the model detected smaller regional traditions within these larger clusters.
One particularly intriguing pattern was a cultural corridor connecting Italy with parts of northern Europe and Britain. This alignment resembles what some historians have called the “Lotharingian axis”—the long stretch of territory from the North Sea to Italy that fell under the rule of King Lothar I after the Treaty of Verdun.
Such findings suggest that political and institutional connections may have helped shape the circulation of liturgical music across long distances.
Beyond Geography
While geography played an important role, the researchers caution that it cannot explain every pattern observed in the manuscripts. A significant number of cases show connections between manuscripts that do not neatly follow regional borders. These may reflect other forms of medieval mobility, including monastic networks, pilgrimage routes, or the movement of clergy and manuscripts between institutions.
The dataset itself also has limitations. The classification of trope elements is based primarily on textual features rather than melodic differences, meaning that some tropes with different musical settings may appear identical in the dataset.
Future research may expand the model to incorporate melodic variation, chronological data, and the sequence of trope elements within chants, potentially offering an even clearer picture of how medieval music traveled across Europe.
Digital Methods and Medieval Music
Beyond its specific findings, the study demonstrates how computational tools can shed new light on medieval cultural history. By combining large digital datasets with statistical modeling, scholars can detect patterns that would be difficult to see through traditional manuscript comparison alone.
“The study demonstrates how powerful data-driven methods can be for historical musicology,” Eipert notes, adding that the same approach could be applied to other musical repertoires and even to entirely different types of cultural data.
For medieval chant studies, however, the findings already offer a striking insight: the political borders drawn in the ninth century did not only reshape kingdoms—they also helped shape the soundscape of medieval Europe.
The article, “Inferring Communities of Medieval Music Manuscripts Using Stochastic Block Models,” by Tim Eipert and Fabian C. Moss, is published in Transactions of the International Society for Music Information Retrieval. Click here to read it.
Top Image: Monks chanting. British Library MS Yates Thompson MS 43
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