Agnus Dei (Mass for Four Voices)William ByrdComposition, Latin text and 1928 edition: public domain (edition status recorded by IMSLP). Fresh transcription credits this historical witness; no modern CPDL or Stainer & Bell permissions are invented or transferred.Tudor Church Music, vol. IX (Oxford University Press, 1928), Mass for Four Voices pp.17–35, Agnus Dei pp.34–35. Editor Richard Runciman Terry according to IMSLP #841694. Complete 19-page historical score retained; separate 1981 Brett excerpt contains no Agnus Dei.Complete three-invocation Agnus Dei, Mass for Four Voices; unaccompanied SATB Latin, through dona nobis pacem.independent-partshttps://s9.imslp.org/files/imglnks/usimg/c/ce/IMSLP841694-PMLP153758-TUD_09_2.pdfDirect manual collation of all 33 engraved bars and four voices on pp.34–35. Original two-flat pitch level retained. The literal historical table has 452 quarter beats; the playable edition uniformly halves all written values to 226 quarter beats, with proportional 4/8 for source common-time C and the same non-metrical bar divisions marked implicit. Two dotted breves (Bassus bar 27 D3 and Tenor bar 31 D4) become tied whole-plus-half notes to keep sounding heads visible on narrow screens, without reattacks or altered underlay. Conventional tenor treble read at sounding octave. Cross-bar augmentation dots are explicit tied continuation heads; other ties are distinguished from underlay melismas. Original Latin A-gnus and independent text placements retained; final fermatas retained. No printed dynamic marks are present. Quarter 60 (equivalent to historical half 60), warm choir and room are performance choices. See the complete transcription, 132-row evidence table and six source-confirmed duration corrections. The recovered 54-bar MXL is a diagnostic candidate only.CantusC.AltusA.TenorT.BassusB.16-2G2quarter60321halfD5481halfbeginAA4161quarterendgnusC5321halfbeginDeB-14321halfA4321halfendi,161quarterG4161quartersinglequiC5321halfbegintolB-14161quarterendlisG4161quarterbeginpecD5321halfmiddlecaC5161quarterendtaB-14241quarterbeginmunC581eighthA4161quarterB-14321halfenddi:161quarterG4161quarterbeginmiB-14161quartermiddleseD5321halfmiddlereG4161quarterendre,161quarterC5161quarterbeginmiD5161quartermiddleseF5321halfmiddlereB-14161quarterendreD5241quarterbeginnoB-1481eighthC581eighthD581eighthE-15241quarterD581eighthD5321halfC5161quarterD5641wholeendbis.321half161quarterB-14161quarterbeginAB-14161quarterB-14161quarterendgnusC5161quarterbeginDeF4161quarterB-14321halfA4321halfendi,321half321halfA4161quartersinglequiB-14241quarterbegintolB-1481eighthendlisC5161quarterbeginpecD5161quartermiddlecaB-14161quarterendtaE-15321halfbeginmunD5321halfenddi,D5321half161quarterC5321halfbeginmiB-14161quartermiddleseB-14161quartermiddlereA4161quarterendreG4321halfbeginnoD5321halfC5241quarterB-1481eighthC581eighthD581eighthB-14161quarterA4321halfendbis,161quarterF5321halfbeginmiE-15161quartermiddleseE-15161quartermiddlereD5161quarterendreC5241quarterbeginnoB-1481eighthG481eighthA481eighthB-14321halfA4161quarterB-14641wholeendbis.D5321halfbeginAD5161quarterB-14161quarterendgnusE-15241quarterbeginDeD581eighthC581eighthB-1481eighthA4161quarterD5161quarterendi,B-14241quarterbeginAG481eighthendgnusC5241quarterbeginDeB-1481eighthA481eighthG481eighthA4321halfB-14641wholeendi,161quarterB-14161quartersinglequiA4161quarterbegintolF481eighthendlisG481eighthbeginpecA4321halfmiddlecaG4161quarterendtaD5161quarterbeginmunD581eighthC54116thB-144116thA481eighthB-1481eighthC581eighthA481eighthB-14161quarterA4321halfenddi,161quarterE-15161quartersinglequiD5161quarterbegintolB-1481eighthendlisC581eighthbeginpecD5321halfmiddlecaC5161quarterendtaD5241quarterbeginmunC581eighthA4161quarterB-14161quarterG4161quarterenddi:321half161quarterA4241quarterbeginDoG481eighthendnaG4161quarterbeginnoG4161quarterF4161quarterendbisB-14321halfbeginpaA4321halfG4321halfendcem,161quarterD5241quarterbegindoC581eighthendnaC5321halfbeginnoB-14161quarterendbisE-15321halfbeginpaD5321halfendcem,D5641wholebeginpaD5321halfendcem,321half161quarterD5241quarterbegindoC581eighthendnaC5161quarterbeginnoC5161quarterB-14161quarterendbisE-15321halfbeginpaD5321halfG4641wholeendcem,161quarterA4161quarterbegindoA481eighthG481eighthendnaG4321halfbeginnoF4161quarterendbisB-14321halfbeginpaA4321halfendcem,D5321halfbegindoD5161quarterendnaD5321halfbeginnoB-14161quarterendbisD5241quarterbeginpaC581eighthA4321halfB4641wholenormalendcem.light-heavy16-2G2quarter60G4481halfbeginAD4161quarterendgnusF4321halfbeginDeE-14321halfD4321halfendi,161quarterF4161quartersinglequiB-14321halfbegintolA4161quarterendlisF4161quarterbeginpecG4321halfmiddlecaG4161quarterF4161quarterendtaE-14241quarterbeginmunD481eighthC4321halfenddi:161quarterB-13161quarterbeginmiD4161quartermiddleseE-14321halfmiddlereB-13161quarterendre,D4161quarterbeginmiE-14161quartermiddleseF4481halfmiddlereD4161quarterendre,F4161quarterbeginmiG4161quartermiddleseB-14321halfmiddlereA4161quarterendreG4241quarterbeginnoF481eighthD4161quarterE-14321halfD4641wholeendbis.321half321half1281whole1281whole961whole961whole961whole961whole961whole961whole321halfF4481halfbeginAD4161quarterendgnusG4241quarterbeginDeF481eighthE-1481eighthD481eighthC4161quarterF4321halfendi,D4241quarterbeginAB-1381eighthendgnusE-14241quarterbeginDeD481eighthC4321halfC4321halfB-13321halfendi,161quarterG4161quartersinglequiF4161quarterbegintolD481eighthendlisE-1481eighthbeginpecF4241quartermiddlecaB-1381eighthendtaF4321halfbeginmunD4161quarterenddi,B-14161quartersinglequiA4161quarterbegintolF481eighthendlisG481eighthbeginpecA4161quartermiddlecaD481eighthendtaG4161quarterbeginmunF144116thE44116thnaturalF14161quarterG4321halfenddi,321half161quarterB-14161quartersinglequiA4161quarterbegintolF481eighthendlisG481eighthbeginpecA4321halfmiddlecaG4161quarterendtaB-14241quarterbeginmunA481eighthG4161quarterF14321halfenddi:321half161quarterA4241quarterbeginDoG481eighthendnaG4321halfbeginnoF4161quarterendbisE-14321halfbeginpaD4321halfG4321halfendcem,161quarterG4161quarterbegindoG481eighthC481eighthendnaG4321halfbeginnoF4161quarterendbisB-14321halfbeginpaA4161quarterendcem,A4161quarterbegindoA481eighthG481eighthendnaG4321halfbeginnoF14161quarterendbisG4641wholebeginpaG4321halfendcem,161quarterG4241quarterbegindoF481eighthendnaF4161quarterbeginnoF4161quarterE-14161quarterendbisD4321halfbeginpaC4321halfC4161quarterB-13161quarterA3161quarterendcem,A4241quarterbegindoG481eighthendnaG4161quarterbeginnoG4161quarterF4161quarterendbisB-14321halfbeginpaA4161quarterendcem,A4241quarterbegindoG481eighthendnaG4161quarterbeginnoG4161quarterF1481eighthendbisE481eighthbeginpaF1481eighthG4161quarterF1481eighthG4641wholenormalendcem.light-heavy16-2G2-1quarter60961whole961whole961whole961whole1281whole961whole1281whole161quarterF4321halfbeginAF4161quarterendgnusG4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