The tune is Ievan Polkka, a traditional Finnish polka popularized by the Finnish group Loituma, and it became the Leekspin meme through a 2006 Flash animation showing Orihime Inoue from Bleach twirling a leek in an endless loop. The animation spread through forums and early video sites, where people remixed the loop, replaced the character and kept the song intact. Its simple, endlessly repeatable structure has helped it survive as a nostalgic internet joke and a shorthand for cheerful absurdity.