I was wandering around upstairs this morning and heard the mini-Elbeno playing downstairs. He was playing “Twinkle, Twinkle, Little Star” on his glockenspiel, a tune he has known for a while.
When I came downstairs, he said “Look what I’ve done!” and I saw that he’d swapped around the keys of the glockenspiel in pairs (C&D, E&F, G&A, B&C were each swapped). And he’d been playing the tune on that variant of the keyboard…