Of all the differences between (typical) Episcopal and (typical) Roman practice, the Episcopal habit of having the choir sing something during the offertory, instead of the congregation, is probably the one I appreciate the most.
However, the Anglicans got the idea from their Catholic forebears
In solemn Mass, the organ may play alternately at the Kyrie, Gloria, at the end of the Epistle, at the Offertory, alternately at the Sanctus, afterwards till the Pater, but more solemnly and sweetly at the Elevation; immediately after the Elevation an appropriate motet may be sung; alternately at the Agnus, and afterwards till the Post-Communion and at the end of Mass.
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