This morning I was called in to sing the a capella chanted Mass. So I took one of the antiphons of today from The Sacred Music Project http://sacredmusicproject.com/ and added a Psalm in the same mode from By Flowing Waters. The other singer and I sang it just like a responsorial Psalm.
The mode in the Sacred Music Project is indicated by the arabic numeral at the beginning of the antiphon. By Flowing Waters has an index of modes in the back. Easy peasy.
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