Is music soul, spirit, or body?
It is tradition that the human being is made of soul, spirit, and body. Therefore, we may wonder to which one of them music relates. To answer what music is, we have first to explain what soul, spirit, and body are. Nowadays, most people do not even know the difference between soul and spirit.
This triad is strongly related to the three causes of sound. The soul represents the inner chord of our being, the higher ideals, the things we would die for and we consider the ultimate goals of our existence.
However, the inner chords remain dumb without an energy or wind moving them. That is the spirit, which the ancient identified as having its dwelling in the blood. The spirit is that force that moves us forward. When we exhale our last "breath", our body dies, because it lacks the spirit to sustain it and make it alive. It is the living blow.
The body, at a subtle level, is identified by the ancients as dwelling in the liver, because the liver produces the bile, which is that which enables digestion. Thus, the body survives because it has a vegetative apparatus that allows it to thrive and digest - i.e. receive nourishment. The dwelling place of the soul is never mentioned, as it draws from Nothingness and therefore nobody knows where it is.
An usual image to explain the components of the human being is the candle, where the soul is the fat, the spirit is the flame, and the body is the battlefield between the two of them - i.e. wick.
Therefore, the soul is always the essence, the fat, while the spirit is the "medium" (water, alcohol, solvents in general). The body, instead, is referred to as "the curse of the earth" - i.e. that part that you cannot destroy by any means and subsists beyond death. That is salts. Even if you submise salts to the strongest fire, they will not vanish.
Another analogy relates, the spirit to the sky and the body to the earth. The soul is the stars and the planets. The spirit is considered always immutable. The soul (stars) dyes it with its healing properties. Thus, herbal tinctures are made of the dyeing color (soul), the medium or vehicle (spirit), and salts. At least, this is how ancient alchemists prepared their remedies. The current knowledge in every field stems out of the observations made possible by mimicking nature - i.e. the Work of Creation. The Latins used to call this Simia Naturae, which means "nature's monkey". This expression means that we need to imitate/monkey nature to achieve anything useful. Therefore, the trinity blueprint was applied to everything.
Soul, spirit, and body are directly related to the three causes of sound in order. Thus, we could relate music to them all taken together. But, in the true, there is one of them that is closer.
To find it out, we need to analyze the properties of music. Sound is a vector of force causing expansions and contraptions in its medium. This leaves out the third cause, as it must be one of the two frequencies making up the standing wave. Therefore, we have to decide between soul and spirit.
There is an entire branch of music called "soul". This might imply that music has most affinity with the soul. However, this is not the case. The bell does not sound if somebody does not move the battant, hitting its chest. Therefore, music identifies with that "windy" and spiritual action, which also serves as the medium to propagate it. Music is essentially spirit and adds an "additional spirit" to the listener - it gives strength and restores one's energy. Actually, it relates to the first real Creation (second cause) when it was still in the mind of the Creator - i.e. in potential.
Music acts as a bridge between the composer's mind and heart and the listener's mind and heart, delievering a sort of "colored" wind - the color referring to the composer's soul. The spirit moves in the listener that same inner chords, raising in him the thoughts and feelings of the composer. In a certain way, the real instrument becomes the listener himself, by resonating with the instrument played by the hands of the player. The player impersonates the spirit and vehiculates it from the composer to the listener.