The opening theme is quite lovely, and the track dubbed "Final Confrontation" is as rousing a boss theme as any you'll hear (why it wasn't reused as Lynx's battle theme in Chrono Cross is a mystery).
Gale, the fight theme, is quite intense, while fitting well with the atmosphere of the game. A redone (and rather lackluster) version serves as the main battle theme in Cross.
Bomberman 64: The Second Attack had a soundtrack that simply radiated epicness. Not like you'd expect any less from Yasunori Mitsuda. Take the Angel theme, for example.
And just in case anyone should have even the slightest doubt that Mitsuda's still got the touch: the main theme of Sands of Destruction. Yeah. He's still got it.
Mitsuda is the longtime childhood friend of Yoshitaka Hirota (see below). And so, doing the friendly thing, he contributed a few tracks to the Shadow Hearts series. And those tracks happened to kick ass, nicely complementing Hirota's already-awesome work.Astaroth, for example, is among Mitsuda's contributions.
Mitsuda only composed one song for Xenoblade Chronicles 1: the ending theme Beyond the Sky. All the other tracks were composed by the other composers including Shimomura.
Mitsuda worked on an obscure and somewhat mediocre title called Tsugunai: Atonement. You are not likely to have heard this song from that game, but you may have heard it from the playthrough vids of the Chrono Trigger fangame Crimson Echoes. It's a pretty kickass song either way.
He had an album called Sailing to the World, which is loaded with awesome. The standout would be Melody of Aqua.
Anyone who enjoyed Mitsuda's work in Xenogears and Chrono Cross will definitely want to check out "Xeno Cross", an amazing half-hour orchestrated tribute album blending together the two soundtracks.
sets just the right tone for the area it's hardcoded into.