Palm Sunday Chant, Part II: Pater, si non potest
The Antiphon for Communion in the traditional Roman Rite (both 1962 and pre-1955), Pater si non potest, is sung after the celebrant’s Communion and during the distribution of Holy Communion to the People.
The text, taken directly from Matthew 26:42, is a short and sad ending for the Palm Sunday liturgy:
Pater, si non potest hic calix transire, nisi bibam illum: fiat voluntas tua. Father, if this cup cannot pass away, unless I drink it: your will be done.