[CathBraun]

hello dave,
welcome! may want to see thread in this forum, "sound of music", started by rhonda. i added there how this has been research area for me too. you most likely saw the references to music in ra material(bk 3,session 54, tone poem, hand of creator to pluck harmony) i found this one, from cayce meaningful:
cayce reading 1469-1:
"for the entity, as each soul, is a portion of the whole. thus, though a soul may be as but a speck upon the earth's environs, and the earth in turn, much less than a mote in the universe, if the spirit of man is so attuned to the infinite, the music of harmony becomes as the divine love that makes for the awareness in the experience of the creative forces working with self for the knowledge of the associations with same."
i have found rudolf steiner's anthroposophy helpful and have many fine links available here in "christ jesus" thread, as overall introductions, in particular, books by edward smith.
much available if you go to www.rsarchive.org
search music, pythagoras, rosicrucian,etc
this is from "christ and the human soul" chapter 4. (it speaks to me. in my research, i quote from st. bernard of clairvaux who writes of "the music of the heart")... nina

"when man takes christ into himself, so as to feel permeated with christ, he is able to say to himself: “the endowment which the gods had allocated to me before the luciferic temptation, but which owing to the temptation by lucifer had to remain behind in the cosmos, enters into my soul with the christ. the soul becomes whole again for the first time by taking the christ into itself. only then am i fully soul; only then am i again all that the gods intended me to be from the very beginning of the earth.” “am i really a soul without christ?” man asks himself, and he feels that it is through christ that he first becomes the soul that the guiding divine beings meant him to be. this is the wonderful feeling of “home” that souls can have with christ; for out of the primal cosmic home of the soul of man the christ descended, in order to give back to the soul of man that which had to be lost on earth as a result of the temptation by lucifer. the christ leads the soul up again to its primordial home, the home allotted to it by the gods.

that is the bliss and the blessing in the actual experience of christ in the human soul. it was this that gave such bliss to certain christian mystics in the middle ages. they may have written much which in itself seems to be too strongly colored by the senses, but fundamentally it was spiritual. such christian mystics as those who joined bernard of clairvaux, and others, felt that the human soul was as a bride who had lost her bridegroom at the primal beginning of the earth; and when christ entered into their souls, filling them with life and soul and spirit, they experienced christ as the soul-bridegroom who united himself with the soul; the bridegroom who had been lost when the soul forsook her original home in order to follow lucifer along the path of freedom, the path of differentiation between good and evil.

when the soul of man really lives into christ, feeling that christ is the living being who from the death on golgotha flowed out into the atmosphere of the earth and can flow into the soul, it feels itself inwardly vivified through the christ. the soul feels a transition from death into life.

so long as we have to live out our earthly existence in human bodies — and this will continue far into a remote future — we cannot hear directly the music of the spheres or have direct experience of the cosmic life. but we can experience the incoming of the christ, and so we can receive, by proxy as it were, that which would otherwise come to us from the music of the spheres and the cosmic life.

pythagoras, an initiate of the ancient mysteries, spoke of the music of the spheres. he had gone through the process whereby the soul passes out of the body, and he could then be carried away into the spiritual worlds. there he saw the christ who was later to come to the earth. since the mystery of golgotha we cannot speak of the music of the spheres as did pythagoras, but we can speak of it in another way. an initiate might even today speak as pythagoras did; but the ordinary inhabitant of the earth in his physical body can speak of the music of the spheres and of the cosmic life only when he experiences in his soul, “not i, but christ in me”, for the christ within him has lived in the music of the spheres and in the cosmic life. but we must go through this experience in ourselves; we must really receive the christ into our souls."