AI-generated conjecture · a wager, not a finding
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The calendar keeps the saint the choirbook lost
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Claim (verbatim)
A saint's proper office - a historia, the full set of antiphons and responsories for the feast - was the most local and most vulnerable layer of the liturgy. Andrew Hughes' catalogue of late-medieval offices registers on the order of 1,500 such historiae, but the feast could be instituted, ranked, and cued by incipit in a house's ordinal or calendar while its music lived in only one or two choirbooks. When those books were lost, the office survives as a name and a rank with the melodies gone: the calendar remembers the saint the choir forgot. The mechanism is custodial asymmetry - the calendar and ordinal, small and constantly recopied as reference apparatus, outlived the bulky notated antiphoner that actually carried the tunes, so attestation of a feast and survival of its chant decoupled. This is the exemplar loss of the sung Middle Ages: not chants corrupted but chants simply absent, present only as the shadow an incipit casts. Prediction restated: among proper saints' offices attested by incipit in a run of medieval ordinals and calendars, the fraction with even one fully notated surviving witness in the chant databases is under a third - a catalogue-to-melody survival ratio far below the near-complete coverage of the temporal core.
Prediction clause (verbatim)
Prediction: sampling proper saints' offices attested by rubric or incipit in a set of edited medieval ordinals and calendars, the fraction with at least one fully notated surviving witness in the Cantus Database or the wider Cantus Index network is under one third, against a temporale core whose notated coverage approaches completeness (primary clause: the under-one-third notated-survival fraction for attested proper offices; the verdict follows it). An office counts as notated-surviving only on an actual melodic witness, not a text-only breviary copy; coverage guard: unindexed sources may raise the fraction, so the threshold is set well below parity and the test voids only if fewer than 100 attested offices can be sampled.
Kill-dataset (verbatim)
Kill (partly built): incipit and rubric lists of proper offices from edited medieval ordinals and calendars (and Hughes' Late Medieval Liturgical Offices catalogue) as the attestation denominator, matched against notated-witness presence in the Cantus Database and Cantus Index; the operation is a catalogue-to-melody 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 decoupling of feast attestation from melodic survival is established in outline - Hughes' LMLO registers proper offices on the order of 1,500, many known from textual sources only, and the historiae literature since Jonsson discusses offices attested without surviving music - but the pinned statistic, the fraction of ordinal- and calendar-attested proper offices with at least one fully notated witness in the Cantus Database or Cantus Index network, has never been computed; no published catalogue-to-melody survival ratio over a sampled run of ordinals was located.
- A. Hughes, Late Medieval Liturgical Offices: Resources for Electronic Research, 2 vols (Toronto, 1994-1996)
- R. Jonsson, Historia: Etudes sur la genese des offices versifies (Stockholm, 1968)
- D. Hiley, Western Plainchant: A Handbook (Oxford, 1993), on proper offices
Predictions
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