AUTHOR'S NOTE: Okay, first Percy Jackson fanfic! I have no idea where this came from, other than the thought that he should be able to play well because music flows. Water flows, and so does music. However, he will not sing because he basically said in The Last Olympian that he can't sing. Also, there is no specific time for this, though it is probably before the 2nd series.
DISCLAIMER: I don't own Percy. I do not own Percy Jackson and the Olympians or anything related to that.
Percy had been in the Big House many, many times, yet he never really noticed the piano. Sometimes he wondered how he managed to miss things like that, because he was supposed to see too much, not too little. Maybe he never noticed it because every time he entered the Big House, something was happening. Yeah, that was probably it.
Over the years, he had been to many schools, many of which had pianos. He got very bored in one of those schools, and then decided to play a few notes on the piano. Soon enough, he was hooked (not literally, even though he was the son of Poseidon). There was something about the flow of the music made by a piano that just called to him. So, he went to practice playing a piano as often as possible, and his skill increased. By now, he could probably be a professional player. Huh, the great Percy Jackson, son of Poseidon, piano and sword fighting expert. He could imagine Annabeth laughing at him. She'd say, "You're such a Seaweed Brain! Do you have any idea how ridiculous that sounds? Can you even play a piano?"
Great, now he was thinking about how he could prove his imaginary Annabeth wrong. Well, at least he knew that for once the daughter of Athena would be wrong. She wouldn't be able to say that, "Athena knows best", anymore. While Percy was thinking of that, he was unconsciously brushing the thin layer of dust off the keys, and pulling the bench out. When he realized what he was doing, the teenager simply shrugged and placed his fingers on the keys. He began playing a simple melody that eventually morphed into a complex and fast-paced song. For once in a century, music rang out of the Big House. Campers, satyrs, dryads, naiads, and a centaur all turned towards the source of the music. "Who's playing? Where's the piano?" Chiron just smiled and whispered, "It's about time somebody uses it."
By the time everybody in the camp reached the Big House, Percy had finished playing. When he exited the building, everyone just gave him confused and surprised looks. "What? Have you never heard a piano?"
"It's not that", Connor started, "It's just that you were the one playing it." Travis finished.