Kirby Fighters and Dedede’s Drum Dash were so popular that HAL decided it would be a good idea to make those 2 minigames stand-alone eShop games and expand upon them. This is the final result. Although more people will probably be going more for Kirby Fighters Deluxe because of how similar it is to Super Smash Bros.
You fight King Dedede as the final boss in Kirby Fighters Deluxe and the music is just one short medley leading up to a remix of Masked Dedede’s theme from Kirby Super Star Ultra.