The entire world is a musical instrument, the pole of the world celestial is intersected where this heavenly chord is divided by the spiritual sun. Earthly music is an echo of this cosmic harmony: it is a relic of heaven.
The fitness of our hearts and thoughts to receive God's spirit is like that of violin strings. If they are properly tuned, in harmony with one another, then the touch of the bow produces beautiful music. If not, then there is only discord. Whenever our hearts are truly ready to receive God's spirit, they will produce heavenly airs and joyous harmonies -- both in this life and in the spiritual world.