Hey, the first town's music in the prologue is from Crazy Richman 2!
Also, the intro music is used on the title screen of VFame's Digimon Sapphire, albeit without the neat added PCM percussion.
Edit: The added PCM percussion gives the music a really neat effect, actually. I sort of like it.
Edit #2: The town music seems to have a weird glitch. Listen to the second loop of it starting at 7:13 in the video-- the bass line starts to become more and more incoherent, like it's out of sync or something.
Edit #3: The compass on the world map is... interesting. It's got north and south, but south is at the top; that's reasonable, because not all maps are oriented northward. But the "S" is forwards, and the "N" is backwards. Bwuh?
OK, I just mucked around with the title screen music in Audacity, and it's not just me: it is being played at double the speed it should be. Still no idea where it came from, though.