I was looking for true temperament guitar strings
and found this site for this guy.
It was interesting.
While researching the true temperament guitar neck
I thought it would be easier and cheaper to make more perfect string sets
(this idea is © Bart Laube 2007)
than to make a neck with crazy frets on it.
I know older sets of heavy flat wound strings sound better then new light gauge string sets,
but the heavier string hurt my hands and make it hard for me to keep playing.
classical guitars have nylon strings so you can play even longer
but you have to hear than plastic sounding string.