Oh yeah - it's not that crazy, but I was in Friends in Akihabara, when I came across Metamor Jupiter - I hadn't heard of it before, so I pulled it out, and on the back of the box, who do I see but my old pal Masaya Matsuura, of Parappa the Rapper fame. I was actually going to see him the next day, so I picked it up, because why the heck not!
So I brought it to his office the next day, and after chatting a while said "hey, do you remember this?" and he said "oh man, I forgot about this game. This is actually the first game with my music in it." - previously he was the songwriter for an excellent band called PSY.S, which is known for its song Parachute Limit, from City Hunter (which also had a PC Engine game made from it, but his music wasn't in there).
So I had him sign the obi (why the heck not), and I asked him what he thought of the game, since I was in japan and away from my console, so I couldn't play it yet. He said he'd never played it. He just wrote some tracks, sent them off, and that was it. No wonder he didn't remember it!