SUNMI & BE'O is a collaboration of the South Korean singers SUNMI & BE'O, together they released on March 22, 2023 a digital single together for a part of a project called [BILLION MUSIC PROJECT VOL. 1] along with the music video for the track.

Lights Out is a retro funky song with ’80s and ’90s vibes. The lyrics convey the empty feelings that surface after the extravagant and bright lights on stage are turned off. The song was produced to deliver comfort to those who experience a similar sense of emptiness. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.