The Flaming Lips, the Decemberists, Kings Of Leon, Cake and Spoon lead the lineup for the first Monolith Festival, to be held Sept. 14-15 at Red Rocks Amphitheatre outside Denver.

Also on the bill are Ghostland Observatory, Clap Your Hands Say Yeah, the Brian Jonestown Massacre, Cloud Cult, Das Efx, Earl Greyhound, the Broken West, Bob Log III, Juliette and the Licks and William Elliott Whitmore.

A host of lesser-known acts will also perform. The full lineup can be found on the Monolith Web site. Tickets go on sale June 2 via Ticketmaster.

Monolith founders Matt Fecher (South Park Music Festival) and Josh Baker (Midwest Music Summit) are co-producing the event with AEG Live.