For Euterpe it was completely intoxicating to hear. There people around them couldn't understand. They were just drunken people out having a party and maybe even annoyed at the man trying to play the piano while other music was happening for them to dance to. They didn't realise that this was Mozart and that even in his day this was the sort of thing he'd done. They were hearing one of the greats play his own music and they couldn't even know.
Euterpe knew though, and Euterpe heard how he played it differently to other people, heard each fall of his fingers on the keys. She felt high on it, her head spinning.