I would often use the Gregorian tones for psalmody when i was serving the Lutherans.
Some high church Lutherans sing plainsong quite often and proudly, and aren't the least bit afraid of it. Other Lutherans sing it occasionally not realising what it is - they are actually quite paranoid about anything remotely Catholic. Tell them that Luther loved Latin, retained much of it in his liturgies, and loved the motets of des Pres and others and it doesn't compute - you just get a blank stare. Lutherans are not taught that Luther loved Latin and would have preferred that Lutheran liturgy be in Latin, purged of certain prayers which in his troubled mind were, shall we say, 'erroneous'. Only at the insistence of some of his even more radical colleagues did he provide them with his Deutsche Messe, which no one uses nowadays.
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