Jack, re: flamenco, I was referring to E F G A B C D E, used in such forms as the Soleares and the Malagueñas. This is not just my own idea, it was explained to me by Antonio Zori, from whom I took flamenco lessons in 1962. And I have a couple of books on the subject. One anomaly is the G# in the E major chord that acts as the tonic in the Soleares. Not a pure Phrygian scale as far as chords are concerned, but the falsettas use the pure Phrygian.

By the way, I have attended workshops with the Medieval Men's Choir, many of whom are also members of the St. Mark's choir. I think they know what they're doing, whether the general congregation does or not. Peter Hallock and his successor certainly do.

Don Firth