A=432Hz is a frequency we choose for tuning our instruments and music. If experienced acoustically, it seems to feel better for singing and for acoustic instruments such as pianos. Tunings such as Twelve True Fifths at A=432Hz and C=256Hz sound richer. Unfortunately it Must be experienced to come to that conclusion. Ultimately you have a choice called free will, and we reserve the right to use A=432Hz or C256Hz as Our choice for music enjoyment and enrichment.