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"You are not a wise man, you tyrant,” raps the Iranian female singer Bahar. “Why do your clothes smell like blood? . . . Why do you crush this cry for justice? The people don’t deserve such disdain.” Her chiding words against Supreme Leader Ayatollah Ali Khamenei go to the heart of the problem that the Islamic Republic faces: the growing illegitimacy of a cruel and inaccessible theocracy whose control over Iran might well be slipping.