I reckon they all play the banjo.Thal
Amish do not play musical instruments because it is viewed as a means of self-expression, which would garner feelings of pride and superiority.
google told me about this tv episode featuring an amish piano prodigy:https://www.imdb.com/title/tt1490096/but amishamerica.com says:Amish church music is unaccompanied, and generally, the Amish do not play musical instruments. Stringed musical instruments such as guitars and banjos are seen as avenues for self-expression which call unnecessary attention to the individual.I expect this would apply to piano playing too.