oOoOO, pronounced as "oh," is an American musical project by Christopher Dexter Greenspan, which came to prominence during the late 2000s and early 2010s. Known for the ethereal and haunting quality of his music, Greenspan became a notable figure within the rise of the "witch house" genre—a subgenre of electronic music characterized by its fusion of ethereal wave, chopped and screwed hip-hop, and elements of noise. His sound often incorporates reverb-heavy vocals, eerie synth lines, and hip-hop influenced beats, creating a gloomy and otherworldly atmosphere.

Greenspan's project made its debut in 2010 with the self-titled "oOoOO EP," establishing a sonic blueprint that he continued to evolve in subsequent releases. His first full-length album, "Without Your Love" in 2013, was well received and cemented his reputation as a producer capable of blending emotional intensity with shadowy, enigmatic soundscapes. Through a sequence of EPs and singles such as "Our Loving Is Hurting Us" and the "Roses / Seaww - Emotion Single," oOoOO has continued to push the boundaries of the genre, while later releases like "Faminine Mystique" and "Gone Fishin'" have signalled an ongoing evolution of his music, further refining his trademark blend of the spectral and the visceral.