Mary Poppins and "Spoonful of Sugar". Then, after the beat down, they are already dead. The "Market Garden" theme for the WW2 games. The final boss of Devil Summoner 2: Raidou Kuzunoha. In Persona 5, "Life Will Change the theme song of the Phantom Thieves of Hearts, can be heard in the last section of Palace gameplay before you steal said Palace's treasure. Prior to that, the Dazzlings get an evil version for their own Transformation Sequence.
This occurs at least once in each chapter of Live A Live, usually using that particular chapter's battle music. Kirika and Mireille of Noir. John's essay my wife theme, Doctor, gets the same treatment, eventually being hijacked by Jade in Cascade. Mario Circuit from Super Mario Kart and Rainbow Road from Mario Kart 64 apply to a lesser extent. The entirety of Episode 25 is pretty much THE defining example of Macross Theme Music Power Ups, combining almost every song in Frontier plus "Do You Remember Love?" And in the Grand Finale of The Movie adaptations, Alto is once again literally powered.
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