Exactly, Jack.

Ye, gods, I'm not suggesting that, with modal songs, one play a different chord with each note of the melody! No more than while accompanying any other song. I would think my examples above make that abundantly clear.

Perhaps my use of the word "sequences" confused the issue. I probably should have used the word "family," as in "chord family." I don't use any more chords (or chord changes) to accompany a modal song than I do with a song in major or minor. Usually three, with occasional other chords from the mode used as "color chords," the same way I might use occasional chords from the relative minor in a song in a major key.

Probably the untutored ear would not even be aware that I'm doing anything different from the other songs I do, apart from noticing that the tune is a bit unusual. Another guitarist, unfamiliar with modes, might note that I'm not using the conventional I, IV, V7 chords in the accompaniment and wonder what I'm up to ("That song's in A minor. What is he doing using a D major as a subdominant!??"). But he or she would note that the chords sound right.

Don Firth