Yea Yeah Yeahs and The Mars Volta will headline Morrison, COs Monolith Festival. The multi-stage festival will return to Red Rocks on September 12 and 13, featuring a mix of indie, electronic, hard rock and hip-hop acts. Girl Talk, Of Montreal, M. Ward, The Walkmen, The Pains of Being Pure at Heart, These United States and The Antlers are among the acts scheduled to join the Yeah Yeah Yeahs on the first night of the festival, while MSTRKRFT, Method Man & Redman, Phoenix, The Dandy Warhols, Chromeo, The Glitch Mob, Passion Pit, WALE, The Thermals, Harlem Shakes and The Features are scheduled to join The Mars Volta on night two.

A variety of ticketing packages are now available. Several additional acts will join the growing lineup in the coming weeks.