Gregofacsimil + neumes from H + rsigns according to H. Slight textual variant (mea->me) heeding the overwhelming consensus of the mss.

Reporting the following modifications from dcrochu: syllabification O-BLI -> OB-LI, flat Si on obliviscaTUR, fixed NABC on MEa (2nd time). Declined to merge the alleluias because the score is harder to read that way. The ligature across the bar serves this purpose.