King's Mouth contains twelve new original Flaming Lips compositions as well as album narration by Mick Jones (The Clash). The record is based on Wayne Coyne's immersive art installation of the same name - which has seen its psychedelic visuals and soundscapes exhibited in museums all around the U.S. including: The WOMB (Oklahoma City, OK), Meow Wolf (Santa Fe, NM), the American Visionary Art Museum (Baltimore, MD) and the Pacific Northwest College of Art (Portland, OR). In addition, the companion book King's Mouth: Immersive Heap Trip Fantasy Experience tells the story of the 'King's Mouth' through words and visuals by Coyne.

As Coyne writes, "The King's Mouth immersive/child-like qualities are born from the same spark and womb as Flaming Lips live performances. The King's Mouth adventure was made for humans of all sizes, ages, cultures, and religions".