Three K-pop artists were listed on Billboard's "The 100 Songs that Defined the Decade" list: BTS, Psy, and Girls' Generation.

BTS (방탄소년단)

When considering the South Korean septet’s legacy, 2015’s “I Need U,” the first single off of BTS-game changing The Most Beautiful Moment in Life, Pt.1 album, was less of a song and more of a revolution -- laying the groundwork for the future of the group, and in turn their rise to international superstars.

Girls' Generation (소녀시대)

And though many, many songs coming out of the South Korean pop scene have played with tonal shifts and BPM switcheroos, few have done so with such aplomb as Girls’ Generation’s 2013 hit “I Got a Boy” -- which is often compared to Queen’s tone-hopping epic “Bohemian Rhapsody” due to its pristine chaotic approach to jumping between musical elements.

Few have done so with such aplomb as Girls’ Generation’s 2013 hit “I Got a Boy”...

-billboard

"I Got a Boy" set the standard for the industry moving forward, and upped the bar for 21st century musical experimentalism.

Psy

“Gangnam Style” had it all: dirty dancing in an elevator; a love-at-first-sight scene in slow-motion; men in yellow tracksuits holding dance-offs in a garage; elderly people on a party bus; children cosplaying as adults. This was the gif-worthy moment when Korean hit maker Psy rode in with his Trojan horse dance, grafting K-pop onto world's collective consciousness.