Stage 5 Boss - Youmu Konpaku's theme
"I tried to give the impression of both "A Tough Opponent" and "Childishness" with this theme. Perhaps this is the most boss-like theme in this game. While it's using guitar, I gave up trying to make it sound like rock music almost immediately. The climax of this theme is in the spirit of youkai."
There aren't a lot of tracks from Perfect Cherry Blossom that use guitars, are there? Thus the SSG channels can actually layer the FM patches for the whole time without any loss of ongoing notes. Also, this is far from the most boss-like theme in this game.