Commentary October, 2017
A good illustration of this phenomenon is the shrinking of diameter of a quarter subjected to high electric power:
https://www.youtube.com/watch?v=d2TDXKfBaMQ - How an 8000V electromagnet can be used to shrink a quarter. The interplay between electric and magnetic forces leads to the Lorentz Force and Faraday’s law of induction which can be used to shrink a quarter, or any other type of metal coin.
https://makezine.com/2009/06/17/coin-shrinking-with-high-voltage-in/ - shrinking captured with high speed camera.
http://www.capturedlightning.com/frames/shrinkergallery.html - gallery of photos.
Of course any physical change in diameter will result in a change of pitch. Same for lengths of vibrating strings and depth and diameter of organ pipes.