I think you're pretty interested in this Manga/Anime.
I will tell you a few things about it.
Admin's note: Of course it's all about headcanons...and Himaruya didn't agree. But that's how I imagine it. Please be respectful ^^
(It can be happen that...
He is very stressed and permanent active. He barely can fall asleep on his own and wake up after a few hours or even minutes.
Prussia someday began to play on his violin or flute (or another instruments. It varies after what Prussia wants to play at the moment) a few calming songs.
Mostly it's classical, Russian stuff.
...Now when I think about it. Germans seem to have a thing for classical music and instruments. I mean...Austria...Prussia...Germany...
If I recall correctly is Norway Germanic as well and Norway plays the violin.
On the other side, classic can be very calming. Russia can play xylophone, piccolo flute and Ocarina.
This is a piccolo flute:
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