If I wanted a drone under a solo/unison Soprano line, would it matter that the tonic E would clash with the occasional F#, especially audible at the minims? Or should it drop to a D# there?
Some unstable intervals come with the drone package, but I would not conclude a phrase on a second, I would either flex to an adjacent interval within the mode, or else rethink the drone note, which in my view does not always have to be the finalis. If the intention is to achieve the effect of a drone (as opposed to oblique organum or another proto-tonal idea), you can't flex often or distantly. I'm not familiar with this piece (the original or Serviam's interesting arrangement) or with Byzantine chant, I assume his approach to harmonizing it is well-informed.
Just for background: this is for a group of a dozen women who started last year to sing unison Gregorian chant. Equally, I first started leading this choir last year, though I have been a choir singer for decades. This year, I want to try out two-part singing. Taking baby steps, I thought we'd try drone first, then organum in thirds, ie the S & A of ServiamScore's arrangement. I'll soon find out if I'm under-estimating them, I know that at least four have sung in other choirs. Serviam's latest two part arrangement would be next on the list. I've been searching for 'bicinia' and 'two part' on this forum and hope to find some really easy ones. Thank you all for your help!
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