Touhou 5: The Grimoire of Alice (Extended)
The BGM heard during "Touhou Mysterious Tall Tale: Mystic Square"'s Extra stage boss battle against the stage 3 boss, Alice Margatroid, now with her grimoire unlocked and her full power unleashed as she becomes "Alice in Magicland".
A high-tension, rhythm-heavy track methodically(?) designed to stimulate the player and help them find the right groove to break through Alice's assault. It makes for the perfect tune for what would wind up being the very last of the PC-98 Touhou boss battles.