I love the storytelling behind that theme:
The composers Sonya Belousova and Giona Ostinelli explains that "There’re many shared similarities between Gol D Roger and the Straw Hat’s captain, Monkey D Luffy, their personalities and character traits absolutely match up, so are their music themes. Monkey D Luffy’s theme is the main theme of our show. Gol D Roger’s theme is Luffy’s theme reversed." "'Wealth Fame Power' opens up with Roger’s theme. It's powerful, just like Roger himself, driving, and dynamic. It’s a dark, mighty anthem featuring the iconic “musical Jolly Roger” - hurdy-gurdy. As soon as the swords are drawn and the crowd rushes out in search of One Piece, we reverse Roger’s theme and introduce Luffy’s theme, the main theme of our show. Roger’s theme is all about the descending motion since this is the end of the journey for Roger. Luffy’s theme, however, is all about the ascending motion since it’s the beginning of his exciting adventure toward becoming the King of the Pirates.”