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The "xylo" is greek for wood
(slrpnk.net)
A lone figure at a party reflects that the rest of the revelers don't know that "xylophones" with metal bars are actually glockenspiels.
Is there an all encompassing term for xylophones and all the instruments that are "Xylophones" with X feature(s)?
I guess, it would be this: https://en.wikipedia.org/wiki/Keyboard_percussion_instrument