As of July 23, 2012 a new Mass Formulary has been promulgated for the feast of Domini Nostri Iesu Christi Summi et Aeterni Sacerdotis (Our Lord Jesus Christ, the Eternal High Priest), which is celebrated on Thursday after Pentecost in some dioceses. See Notitiae 2012, 335-368.
There are no Gregorian chants assigned to the Mass Formulary, but in the Extraordinary Form there is a votive Mass of the same title. Therefore, I think it's safe to take these chants for this feast. See the attached pdf. A week too late, but perhaps this may be of use to you next year!
There are no Gregorian chants assigned to the Mass Formulary, but in the Extraordinary Form there is a votive Mass of the same title. Therefore, I think it's safe to take these chants for this feast. See the attached pdf. A week too late, but perhaps this may be of use to you next year!