The answer to this question depends upon how seriously you take the injunction that Gregorian chant have pride of place, and whether you would take that principle to the point of preferring a Gregorian gradual over a responsorial psalm (which GIRM does allow). If you do, and I do, then what you do there should at least point in that direction, and the use of a psalm tone might be a step in that direction. Likewise, I would experiment with the English settings of the Graduale Simplex (such as By Flowing Waters). I do not find these ideal in any sense, but they are probably better than the OCP things.
In my view, the problem with the OA settings is partly in the texts; the texts are so short that it is hard to compose a refrain melody easy enough for the congregation to pick up on the fly that has substantial musical coherence, this coherence depending upon elements of repetition and of establishing a clear tonal or modal center. Thus so often you hear a final cadence in these melodies that is not very final. In such a short space a very final cadence seems trite and a not so final cadence seems incoherent.
The more serious question about the responsorial psalm or gradual is what is the purpose of that part of the Mass proper? That is something that I addressed a little bit at our colloquium last summer, and will address in Sacred Music in a future issue.
I would also include a segment on Gelineau psalmody. Sure, the Grail psalms aren't approved for Mass, but any parish that has Worship hymnals is pretty much stuck with them -- and, furthermore, if the stuff OCP/GIA/etc. publishes can be used as a responsorial psalm, then surely the Gelineau repertoire is legal. The reason I bring it up is because, as an organist, I am astounded at how many cantors have no clue how to sing them properly. (And, conversely, as a cantor, I am astounded at how many organists don't know how to PLAY them properly.)
By Flowing Waters is on your list. This is, I say in much company, a fine and well-grounded contribution to the repertory. There is only this problem: it falls far short of providing Propers for all the Sundays in Tempus per Annum. Why? (Do I have a faulty copy?)
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