Yesterday I was discussing the modes with my Advanced Schola (aged 9-17), and was trying to explain the dominant. I said that in Psalms it's the reciting tone, and in other chants the melody circles around it and it is like a second home for the mode.
I was searching for images: a ledge a few feet above the ground (i.e. the final), or a magnet for the melody, or like what happens when a balloon is held up by blowing air.
I was wondering if folks had other ideas for images, and also what the resources are.
I view the tenor, wrong though I may be, as a "place of action". It wants to go somewhere. I always point to Kyrie XI: sing a couple neums and then hold the A. You can't help but go back down the scale!
The dominant to me is a bird hovering on a thermal updraft along the coastline. Rising some, falling some, staying at the same altitude - all with apparently effortless grace.
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