. To anyone who grew up in the Seventies- myself not included- the words are guaranteed to strike a chord, not only of heavy metal guitar feedback, but of sweet nostalgia for those carefree days of innocence, exuberance, and wonder. Well, not really. What that old Led Zeppelin number brings to mind, with its slow, grinding rhythm punctuated by head-banging howls of rage, is the darker side of adolescence; the boredom, the frustration, the zonked-out quest for meaning that marks our transformation into mature and responsible members of societ ....