By adeptly playing one of this precious platformer's signature tunes on a pair of pianos, that's how.
The "Butter Building Theme" played in the clip above was transcribed and arranged by Gary Swerdlow, by the way. Listen more of his work on his YouTube channel. Don't expect to hear any more Kirby's Epic Yarn tunes, though--this is the only one he's done (thus far).
Speaking of Kirby, did you know that little pink puff's latest portable title, Kirby Mass Attack, is now available for purchase? Pick up a copy of it here. Also, Kirby's Return to Dream Land, for Wii, will hit store shelves soon, too. (On Oct. 24, to be exact.) Pre-order it here.