Both Uses

dissonance
in
The Lords of Discipline
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Nothing had alarmed me quite so much since I had come to the Institute as the volatile dissonance of that exquisite soundlessness.†
Chpt 2.16 *

dissonance = not going well together or conflict
On Sundays, Charleston, without the dissonance of commerce or traffic, had the serene regularity of a city so magical in its harmony, so purified of stridency or disorder, so certain of its virtues, that it seemed a city separated from its century by an incorruptible cleanliness of spirit and image, a perfect environment for recreation and quiet pleasure.†
Chpt 3.25

Definitions:

(1) (dissonance)
a lack of harmony—either in sound or between thoughts, beliefs, or actions
(2) (meaning too rare to warrant focus)