Labyrinth of Touhou OST - Ariori 煉獄庭園 (中ボス戦闘) (Boss battle theme #1)

Labyrinth of Touhou OST - Ariori 煉獄庭園 (中ボス戦闘) Boss battle theme #1 This is the track that sounds during some boss battles, such as Meiling’s. Why is it so catchy?