ok but austria literally has at least 2 pianos in his house according to prussia’s cleaning game. one when you first walk in, and another in some sort of study.
the one u first see is the guest piano that he will let ppl play, the study one is his personal piano, he keeps another in a locked vault in his house and he trusts very few people with knowledge of his existence and 0 people with knowledge of what it does, 27 of them he rescued from craigslist/the street because they looked lonely,
which one was he playing in the ocean or does he have a separate gig piano
roderich has gag piano stations all across the globe, much like when the batmobile appears from random and convenient locations in gotham city. when needed, the piano can drive itself to roderich’s location via gps signals.