Roky Erickson and his group the 13th Floor Elevators spread the psychedelic gospel in the heart of Texas in the 1960s and influenced groups like R.E.M. and ZZ Top. After a tumultuous life that included a long battle with schizophrenia, Roky died last month at 71. Hosts Jim DeRogatis and Greg Kot pay tribute this week on Sound Opinions. Plus, Greg interviews Jim about what he learned about the nature of music in 19 years of investigating R. Kelly and they say goodbye to Dr. John.