OR3O is a Korean American YouTube musician known for her covers, remixes, and original songs. She is known for her fan-made songs about videogames, with some of her most popular songs being "All Eyes on Me", a song about Bendy and the Ink Machine. "Greedy", a song about Cuphead. "Doki Doki Forever" a song about Doki Doki Literature Club!, and many more.

OR3O is also well-known for her work on her original electro-swing album named Clover. Released in 2021, Clover is a very successful album, with songs in the album such as "Help Me" hitting 20+ million views on YouTube. The combined view count for all the songs in Clover on YouTube stands at 75+ million views as of June 23rd, 2023.

Most of her music is produced together with Genuine, who she met at school when they had to share a dorm. OR3O, in her song "All Eyes on Me", has made the beat herself, but asked Genuine to polish it and use some instruments from him.