A well-tuned piano is actually slightly out of tune. The ratios used to tune it "perfectly" go out of phase at the far ends. http://music.stackexchange.com/ques

A well-tuned piano is actually slightly out of tune. The ratios used to tune it "perfectly" go out of phase at the far ends. http://music.stackexchange.com/questions/14244/why-are-pianos-traditionally-tuned-out-of-tune-at-the-extremes http://music.stackexchange.com/questions/14244/why-are-piano...