Source: PL-Wn 12497 IV Graduale cistercienseSequence: 1Feast: Antiphonae MajoresOffice: VGenre: ACantus ID: 004010Full text: O clavis David et sceptrum domus Israel qui aperis et nemo claudit claudis et nemo aperit veni et educ vinctum de domo (...)External image link: Image link
Cantus Planus in Polonia 