http://www.collective-evolution.com/2013/12/21/heres-why-you-should-convert-your-music-to-432hz/ According to Prince, who posted about this article in some FB post, 432 Hz should be what A is tuned to for every instrument out there. I never thought about that before, "Why is A 440 Hz?". Turns out, no reason. Also, classical pitch is standardized to 432 Hz. Phish should give it a go and see what happens at a show.