Strictly speaking, instrumental solo music is not permitted at requiem masses. However, I can see a case for allowing quieter, solemn music for pastoral reasons.
Technically, no, it's not. Funerals have the same rules for instrumental music (only used to accompany singing) as the rubrics for Lent.
That said, pick up Gerald Near's St. Augustine Organbook. There is a great setting of both the Requiem and the In Paradisum in there. Both pretty easy, too.
And so we can fall back on the widely accepted justification for instrumental music at funerals, lent and advent by playing such music before and after the Mass, right?
So it took two years to reach this conclusion? LOL. I haven't seen any documentation that states instrumental music is banned in the OF for funerals, only during Lent. Accompanying singing is allowed.
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