Helios is the downtempo/ambient electronic project of Keith Kenniff, a multi-talented composer also known for his neo-classical work as Goldmund. His recordings as Helios typically mix moody synthesizer textures and slow, glitchy beats with fragile melodies played on pianos, guitars, and other acoustic instruments. After establishing the Helios sound and gaining a cult following for his early releases, particularly 2006's Eingya, Kenniff became an in-demand composer for film, television, and advertising. He remained prolific, regularly issuing albums as both Helios and Goldmund, in addition to making shoegaze/indie pop along with his wife, Hollie Kenniff, as Mint Julep. Following 2008's Caesura, much of Helios' output was issued by Kenniff's own Unseen Records, including 2010's Unleft and 2015's Yume. Helios has released albums on Ghostly International since 2018, including the vibrant, guitar-based Espera (2023).