During Otakon this year I was jamming to various game and anime tracks on my bass in the halls. Saturday night a Persona cosplayer (can't remember if he was from 3 or 4) came up to me and asked me to play his theme. Not having played any of the Persona games before, I was completely at a loss for what he was requesting until I remembered that I had been playing the ending to Catherine earlier that day. I started playing it again, and he's like, "Yeah, that's the one!"
Unfortunately, in all the excitement of the rest of the weekend I forgot which character he was, and while researching this has produced some enjoyable hours spent on YouTube, I haven't found anything that I would have mistaken for Catherine's ending.
Can anyone pin down the character in question?
EDIT Here's the song I was playing: