in Music, are such as are fit for music, next to, and in combination with, concords; being neither very agreeable nor disagreeable in themselves; but having a good effect, as by their opposition they heighten the more essential principles of pleasure: or as, by their mixture and combination with them, they produce a variety necessary to our being better pleased.

CONCINNOUS System, in Music. A system is said to be concinuous, or divided concinuously, when its parts, considered as simple intervals, are concinuous; and are besides placed in such an order between the extremes, as that the succession of sounds, from one extreme to the other, may have an agreeable effect.