The only known reference to the Laws of Color and of Music and Rhythm by Alice A. Bailey (AAB) in her voluminous writings and those given to her by Djwhal Khul (DK). Links on these pages of the Laws of Alice A. Bailey are to the online books at the Lucis Trust website.
What is a law?
… a law is but the spiritual impulse, incentive and life manifestation of that Being in which he lives and moves. A Treatise on White Magic , INTRODUCTORY REMARKS
A law is an expression or manifestation of force applied, under the power of thought, by a thinker or group of thinkers. Discipleship in the New Age, Vol. I , SECTION ONE – DISCIPLESHIP IN THE NEW AGE – Part 2
… a law is in reality the effect of the life of a greater entity as it encloses a lesser within its living processes.
Esoteric Healing , Part Three – The Fundamental Laws of Healing
… a law is but the effect of the continued intelligent activity of the Life aspect as it works in conjunction with matter. Esoteric Psychology – Volume I , 5. The Rays in Cyclic Manifestation
A law is only an expression or manifestation of force, applied under the power of thought by a thinker or group of thinkers. Esoteric Psychology – Volume II , II. The Seven Laws of Soul or Group Life – Part 5
A law presupposes a superior being who, gifted with purpose, and aided by intelligence, is so coordinating his forces that a plan is being sequentially and steadily matured. A Treatise on White Magic
Not much information here other than there are these 27 occult laws which are not now published and you will learn after some stage of initiation? Possibly of interest is the mention of the “fourth Ray of Harmony,” although in most of AAB’s work this is expressed as the “fourth Ray of Harmony through Conflict.” I did see this here:
2. The personality ray—the fourth Ray of Harmony.
3. The ray of the mind—the fourth Ray of Harmony.
Some definitions of “occult” that might be of interest:
The one quote I found below:
The laws of fire will be gradually permitted exoteric publication; there are twenty-seven occult laws which are only revealed after initiation at this stage of evolution. In them are summed up the basic laws of color and of music and rhythm. When music produces warmth or stimulation, and when pictures, for instance, glow or reveal the subjective within the objective, then will this fourth Ray of Harmony be coming to fruition.
You are welcome to post your comments and understanding of this law.