OR3O

OR3O (stylized OR3O★), real name Euria Sin, is a Korean-American singer-songwriter and producer widely regarded as a pioneering figure in the nerdcore music scene. She began uploading songs to YouTube in 2015, starting with a cover of «Unravel» by TK from Ling tosite sigure, and quickly built a following for original songs, covers, and remixes inspired by video games, anime, movies, and television shows.

Her sound blends pop, electronic, and rock elements with occasional rap verses, often built around high-energy hooks and dramatic, story-driven lyrics tied to fandom themes. She has become known for a distinctive, powerful vocal style and elaborate music videos that lean into gaming and internet culture aesthetics.

OR3O has collaborated extensively with other artists in the nerdcore and internet-music space, including CG5, Random Encounters, The Living Tombstone, and RichaadEB, the latter of whom helped her remake her debut cover years after its original release. Tracks such as «Doki Doki Forever», «All Eyes on Me», and «Digital Hallucination» reflect her continued focus on fandom-driven original concepts alongside her cover work.