Basic intervals of the melody, from what I remember, along with apparently playing every piece on acoustic guitar.
To answer Toad, as I said earlier, the fourth* Chrono game is supposed to be Chrono Brake. I believe it was once registered in America as Chrono Break, but that expired a few years ago. Most of the team that made Chrono Trigger left after Xenogears and before Chrono Cross, and I think a lot of the Cross personnel are gone now too. Still, if a few of the key players were involved and if Yasunori Mitsuda did the music, we would be in for another great game, I'm sure.
*Radical Dreamers is the second.