Equally absurd and beautiful art-rock overtures can be found throughout Amputechture. "Tetragrammaton" is signature Mars Volta, a cerebral 17-minute opus based on the real murder of a Romanian nun, who was killed because she was supposedly possessed by the devil. It's broken into symphonic movements interspersed with indulgent guitar solos, otherworldly studio effects, and Bixler-Zavala's creepy screams.
"Viscera Eyes," the most accessible single, may begin with catchy rapid-fire guitar (played by the Red Hot Chili Peppers' John Frusciante), but it devolves into a nine-minute Yes edifice that ends in white noise and wah-wah pedals. The other songs are just as exhausting and extraordinary, requiring the patience and endurance of an audiophile who enjoys the hedonism of such art noise.