Happy? Soul's never really thought in terms of happy, when it comes to music. There's what he's composed himself, but he is far too insecure to play that. It's enough of a push to make himself play anything at all!

He exhales and lifts the cover, staring down at the keys for a long moment. Finally, he begins playing.

He doesn't like the darker things he tends to come up with when he plays by heart. But he can't really change it, either.