'Instruments of music' have sometimes an opposite or bad sense in the Word, and signify gladness and joy resulting from the affections of evil and the falsity. (See Isaiah 5:11, 12, 23:15, 16) 'Instruments of music' in other places signify the pleasant and delightful affection of spiritual and celestial things.

(Referencat: Arcana Coelestia 8337)