=001  1000000684
=031  ##$a13$b3$c1$gC-1$m[D]$oc$p9ECEA-A1{EF}GA[2.''C4'B;3]1AG-$qC1 and C2 clefs are present; o mensuration sign shown above c$tKyrie eleison
=031  ##$a13$b3$c2$gC-5$m[Ct]$nbB$oc.$p0,A9[,FAD1C2.F4E1C2--1F2AB1'C,FG9.F2--$qC4 and C5 clefs are present; o. mensuration sign shown above c.
=040  ##$aAuArU$beng
=041  0#$aLatin
=100  1#$aJean de Ockeghem$d1410-1497$0160
=240  10$aMissa Prolationum: Kyrie II$m4vv$0271
=245  10$aChigi Codex
=500  ##$aAlthough this section of Ockeghem's Missa Prolationum is frequently listed as a double canon at the third above, the Discantus voice in C and Ct voice in C. are clearly the duces. Consequently, the comes of the Discantus is sung a third below, and the comes of the Ct as third above. This produces the unusual vertical shift of the comes duet so that intervallic relations between the original duces voices are contracted by a fifth (vv=-4).
=590  ##$aVocal parts: D, Ct$bf.106v-114$801
=593  ##$aManuscript copy$801
=594  ##$bVocal parts - 4 in 2: D1, [D2], [Ct2], [Ct1]$c4
=650  07$aMass Section$012
=650  07$aOrdinary of the Mass$08
=695  ##$amensuration canon$b2$c4$dex$e3rd$e3rd$fbelow$fabove$g0$g0$h $h $oCO$oC.O.$0341
=773  18$w1000000075
=852  ##$aV-CVbav$cMS Chigi C.VIII.234$eBiblioteca Apostolica Vaticana$x87
=980  ##$aRISM$bstandard$cexamined