Unwind: Listening to solfeggio frequencies need to be easy — make it possible for you to generally be current with the sound vibrations because they clean around you and make it easier to chill out. The A4 at 440 Hz is highlighted about the chart. For more geeking out, https://frequency-396-hz-on-youtu35308.bloggactivo.com/31706162/everything-about-396-hz-frequency-music