400. Any Mass for the dead may be either sung or low.
401. The absolution over the corpse or over a catafalque:
a) must be held after a funeral Mass;
b) may be held after the other Masses of the dead;
c) may be held, for a good reason, even after Masses which are not of the dead.
An Absolution after a Mass of Requiem must be given by the celebrant of the Mass. Only the Bishop of the diocese has the right to give Absolution after a Mass of which he was not the celebrant; a titular bishop does not have this right, and it is the more probable view that he cannot be delegated to exercise this right in the name of the Ordinary.
our priest from the FSSP told me that the absolution must be sung even if it’s a low Mass
An Absolution without the body being either physically or morally present is permitted after any (even low) Mass of Requiem, provided that the Absolution is celebrated with chant.
[different section] If on the occasion of a funeral the prescribed Absolution cannot be given with chant, it must be given without chant but with holy water and incense.
The choir shall not begin the singing of the Libera, until the celebrant and the crucifer have taken up their proper position at either end of the coffin or catafalque; on the occasion of a funeral, moreover, the singing of the Libera shall not begin until the celebrant has finished the Non intres.
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