but here's something I noticed with my music hobby. The true mathematical and human body resonant frequency for tuning to true A is 432Hz. All music standards were changed in 1955 with the popularisation of music in homes and radio to resonate at 440Hz as this was dictated by the broadcasting industry as "better for their technology and a better standard for worldwide musicians". Basically, everything you listen to is detuned to misalign with your bodily resonance. Just something to be aware of and this is why binaural is important as it's frequency specific to human resonance.