Did the 13th Floor Elevators invent psychedelic rock? Aficionados will be debating that point for decades, but if Roky Erickson and his fellow travelers into inner space weren't there first, theywere certainly close to the front of the line, and there are few albums from the early stages of the psych movement that sound as distinctively trippy -- and remain as pleasing -- as the group's groundbreaking debut, The Psychedelic Sounds of the 13th Floor Elevators. For the first time in 40 years, here it is in dangerously powerful MONO, exactly as it was intended: the stupefying debut album by Texas' original psychedelic heroes, the 13th Floor Elevators, on Sundazed's uncannily accurate high-definition vinyl.