As Mr. Sullivan writes, "Many comedians have distinctive voices, but only a few are fortunate enough to develop one that's never been heard. George Carlin's voice was unmistakable. In his younger years he had the mellow, quizzical tone of a perpetually amused pot smoker. Later it aged into a hard-earned rasp. Throughout his various stages, this one-of-a-kind voice - quintessential New Yorker, representative hippie, reflexive contrarian - spoke for a nation of dissatisfied idealists and for himself alone."