#FamilyIsEverything. APL = 5.55/10 *Authorized conspiracy theorist *Not an authorized preacher.
Michael Turrell has taught about the healing nature of A=432 (rather than 440) in his "Wholetones" series. He has CDs with the lower pitch. The "devil's interval" mentioned is the dissonant diminished fifth (augmented fourth). I'm a professional musician/teacher. I am not totally sold on this concept of the lower pitch being that important. I think it is more important for your health/spiritual life that music be tonally based (consonant) - for example Mozart or Bach, rather than Schoenberg.
https://wholetones.com/
Wholetones: Music for Peace, Healing, Sleep, and Energy - The Healing Frequency Music Project
Introduced to the world in 2014 as the Healing Frequency Music Project by renowned musician Michael S. Tyrrell, Wholetones has grown into a full line of award winning solutions for many of the most common problems found in today’s society.
https://wholetones.com/