From its artful beginnings (Syd Barrett-era Pink Floyd, the Mothers of Invention, and those progressive forebearers, the Sgt. Pepper-era Beatles), through the towering guitar solos, monumental synthesizer banks, and mind-boggling special effects of the Golden Age of Prog (Rush, Pink Floyd, Yes, ELP, Genesis, Jethro Tull, King Crimson, UK), through the radio-friendly "pop era" (Asia, the Phil Collins-led Genesis, and a reformed Yes), and right up to...