Avenged Sevenfold have cancelled the remainder of their U.S. tour because frontman M Shadows has lost his voice.Shadows has battled longterm voice fatigue and underwent surgery several years ago to correct an ongoing medical issue. He had to cancel a performance at Britain's Reading Festival in August for the same reason.Now doctors have ordered him to rest his voice for a month - forcing the band to sit out the rest of its American dates. The tour will resume in October in Japan.

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