to my knowledge howling is not signal for "im being hurt/ that thing is annoying". its normally for communal purposes. In the wild its to call wolves together, communicate over long ranges, to mark territory. Unfortunately it can also be a call for "war" with another pack. (i doubt its that, unless he tries attacking your piano lol)
because (i hope) your dog is domestic, its most likely just a trait passed down from long ago. that one chord/note may just "remind" him of the wild, thus he howls.
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