Originally Posted by LarryShone
Any istrument that employs strings under tension is gonna be subject to detuning, whether played or not.

One could IMAGINE a string instrument that (by design) does NOT.

Lets see, the effect of increasing temperature on (most) materials that could be used for strings is to expand them, i.e. to reduce their tension and therefore the pitch.

OK, but that ASSUMES that the length remains constant.
I see no good reason to not design some way of changing the length to directly compensate - not that I have a solution, just the notion that it COULD be done.
("length" should probably be "speaking length" ?)

I know, I know, this may be impractical for "pianos" (as currently defined).

...and yes, the double negative probably COULD have been avoided.