In regard to metaphors, none sounds as good as The Wall, Pink Floyd's legendary 1979 prog-rock opera about abandonment and isolation. Clocking in at just over an hour and 20 minutes, The Wall explores the story of its protagonist, Pink, building a metaphorical wall between himself and everyone else. Though fictional in nature, elements of this character are clear representations of Pink Floyd's complex history. And for the group's principal songwriter and bassist, Roger Waters, The Wall is a seemingly semiautobiographical sonic journey. "Comfortably Numb," for example, is about a "sleazy Philadelphia doctor who injected [Waters] with tranquilizers before a gig when he was suffering from hepatitis," according to Rolling Stone. "That was the longest two hours of my life," Waters told the music magazine. "Trying to do a show when you can hardly lift your arm." To this day, The Wall remains one of rock music's most celebrated records. And though Pink Floyd hasn't toured together since the mid-'90s, Roger Waters continues to perform the album in its entirety, complete with an elaborate stage show and the very emotion that made it so great to begin with.