Crank up the distortion, don the leathers and frizz out on your biggest hair. It’s Rock Night on American Idol.Under the tutelage of famed Guns n’ Roses and Velvet Revolver guitarist Slash, the four remaining American Idols (Adam Lambert, Allison Iraheta, Danny Gokey and Kris Allen) hope to blaze the performance stage Tuesday and inch [...]

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