LOS ANGELES—Her mood dangerously optimistic at the end of the school year, teenager Christine Lowell was reminded of the need to assume a sullen, self-pitying manner Monday by the Fiona Apple song "Sleep To Dream." "God, I don't see why I should have to continue facing these phonies every day of my miserable life," Lowell said after the song came into rotation on her MP3 player. "I can't be, you know, stifled by your insignificant ways, all right?" At last report, Lowell's mother, the only witness to Christine's sudden and deliberate mood change, had resumed driving to the supermarket without comment.