Feast: Ordinarium Divini Officii ad Matutinum
Office_part: in
Cantus ID: 001120
Status: SELECTED
Rsigns from LH83
Coherence with other 6a/6a2 invitatories
Added NABC + standardization of the "Venite adoremus" part (NABC absent from SG391p257 where other 6a invits are)