couldn't use them liturgically
Kyrie fons bonitatis was the most common ordinary sung in the Germanies in the late mediaeval era and it continued to influence Lutheran liturgy and chorales. A vernacular version of the kyrie with its tropes appeared as a chorale (whose tune is a metrical version of the chant) and remains in use today in Lutheran churches. The chorale is Kyrie Gott Vater in Ewigkeit. It has three sections (the other two being Christe, aller velt Trost, and Kyrie Gott Schopfer Heiliger Geist) and is the chorale referenced in Bach's mighty setting of this chorale in the ClavierUbung, pt. III. The chorale is quite solemn and would make a grand anthem on some Sunday or other. It can be found in English translation in most any Lutheran hymnal. Though it would be appropriate for any number of Sundays, it would be, I think, particularly apt for Trinity Sunday (as would Bach's great organ 'tryptich')....Fons bonitatis, and maybe another...
Very few of the medieval tropes fit the new pattern, however Deus genitor alme does. The RM for England&Wales is explicit "Invocations naming the gracious works of the Lord may be made", alas there is still a tendency for older priests to make up something like O Lord, for the times when we have offended against you; Lord have mercysingulis acclamationibus « tropus » præponitur
You were sent to heal the contrite of heart: Lord, have mercy.
You came to call sinners: Christ, have mercy.
You are seated at the right hand of the Father to intercede for us: Lord, have mercy.
You take away the sins of the world, have mercy on us.
You take away the sins of the world, receive our prayer.
You are seated at the right hand of the Father, have mercy on us
Have mercy on us, O Lord.
For we have sinned against you.
Show us, O Lord, your mercy.
And grant us your salvation.
I confess to almighty God...that I have sinned...through my fault, through my fault, through my most grievous fault...
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