AI-generated conjecture · a wager, not a finding
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The words outlived the tune
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Claim (verbatim)
Chevalier's Repertorium Hymnologicum is a census of Latin liturgical poems - tens of thousands of numbered hymn, sequence, and rhymed-office incipits, assembled from the texts wherever they occur. A melody census is a different and much smaller thing, because text and tune traveled on different carriers. A hymn text propagated in breviaries, hymnals, psalters, and literary miscellanies, none of which needed notation; its melody lived only in the notated hymnal, a rarer and more fragile book. The mechanism is differential carriage: the text had many redundant, un-notated homes and the tune had few notated ones, so as books were lost the tune was lost first and the text survived to be catalogued by Chevalier. The Repertorium therefore counts a population most of whose melodies are already gone - the numbers are text-survivals, and the join to any melody census exposes how few kept their music. Prediction restated: among Chevalier-numbered hymns and sequences, the fraction with any recoverable medieval melody - a notated witness in the Cantus databases or a melody assignment in the Analecta Hymnica apparatus - is under a quarter, and the melody-survival fraction falls further for the later, regionally proper items.
Prediction clause (verbatim)
Prediction: sampling entries from Chevalier's Repertorium Hymnologicum, the fraction with any recoverable medieval melody - a notated witness in the Cantus databases or an explicit melody assignment in the Analecta Hymnica apparatus - is under one quarter, and the melody-survival fraction is lower for post-1200 rhymed and regionally proper items than for the pre-1000 common hymn core (primary clause: the under-one-quarter melody-survival share of the text census; the verdict follows it). A melody counts only as an actual notated or assigned tune, not a presumed contrafact; coverage guard: unindexed melodies inflate loss, so the quarter is a ceiling on true melody survival, and the test voids if fewer than 300 Chevalier entries are sampled with resolvable status.
Kill-dataset (verbatim)
Kill (partly built): Chevalier's Repertorium Hymnologicum numbers as the text-census denominator, joined entry by entry to melody presence in the Cantus databases and to melody assignments in the Analecta Hymnica apparatus as the numerator; the operation is a melody-to-text survival ratio.
Nobody has run this test. The kill-data is named above. If you can run it — or you know the paper that already settles it — claim the kill or submit the prior scholarship. Kills and prior scholarship are credited here, by name, as they come in.
Provenance
Run: Fresh agent generation · model: claude-fable-5
Fresh blind generation by claude-fable-5, 2026-07-17, liturgical-chant wave on CANTUS/Cantus Index, Corpus Troporum, and Analecta Hymnica/Chevalier. Every Kill names a real chant instrument and a countable census or inventory-geometric operation - transcribable-to-total ratios, source-count geometry, singleton (unica) fractions, catalogue-to-melody survival ratios, feast-rank concordance-breadth gradients, contraction ratios, and text-to-melody attestation lags - with thresholds far from 1 and explicit coverage guards distinguishing what the databases index from what existed. Operation family kept DISJOINT from the owned w09 music_liturgy ground (which joins chant metadata to external economic/material datasets: freight, wax, plague, mints, fairs, necrologies) and from the w08 chant cluster (variant-rate, melodic dialect, differentia decline, lesson-length, copying-error forensics). 0 items dropped; deliberately steered clear of w08-039 (Old Hispanic copying-error profile), w08-001/003 (feast-age variant rate / differentia), w09-026 (Old Roman property network), w09-016/035 (trope economics/prosopography), and w09-022 (sequence fair-network) by using pure census/inventory-geometry operations on the named instruments. Confidence flags on exact counts recorded in the register report. Slugs via django slugify.
Novelty / leakage triage
anticipated in the literature — this exact test has never been run
The asymmetry is textbook in outline - Chevalier's census runs to tens of thousands of text incipits while Stablein's melody corpus for the medieval hymns numbers in the hundreds - but the pinned statistic, a per-entry melody-survival fraction over a Chevalier sample joined to the Cantus databases and the Analecta Hymnica apparatus, has never been computed; and its value is genuinely open, because shared tunes and contrafacture mean the text-census and melody-census totals do not divide into a per-entry survival rate without exactly this join.
- U. Chevalier, Repertorium Hymnologicum, 6 vols (Louvain, 1892-1921)
- B. Stablein (ed.), Hymnen I: Die mittelalterlichen Hymnenmelodien des Abendlandes (Monumenta Monodica Medii Aevi 1; Kassel, 1956)
- J. Szoverffy, Die Annalen der lateinischen Hymnendichtung, 2 vols (Berlin, 1964-1965)
Predictions
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