Chrono Trigger in FF6?

there's a music hacking tutorial on this site, but what you want to do sounds like SPC injection, because the games music engine is so similar and there is no need to compose it, but you must learn how to hex edit and the songs are documented here on this site, for both FFVI and CT. They share the same SPC engine so you would need to replace the song data and change some commands around. But, it's not -that- easy, especially without knowing anything about hex.