this video is very similar to the one above showing much of the same footagebut with overview by what I can only guess are by the developers.
http://www.nicovideo.jp/watch/sm1633229
to see this one you might have to make an account- although a japanese site it's pretty straight forward.
The music in this video... The instruments sound so similar to the ones in Chrono Trigger... Is this the actual music written by Yasunori Mitsuda before it was prepared for SNES?!
The sax(?) (several songs), the music box (Marle's theme), the lead instrument in Schala's theme... They are so similar to the SNES music, but richer.
A couple songs have significant differences, of course. Many of Wind Scene's parts are an octave lower, the brass section plays a different tune during a portion of Courage and Pride, and Battle 1 has several changes in the final Chrono Trigger: new percussion, background strings becoming rhode, etc.......
So interesting!!